PHP

In PHP, the isset() method is used for checking if one or more variables have been declared and are not null. $variable = "I'm a variable"; if (isset($variable)) { echo "variable has been declared!"; } else { echo "variable hasn't been declared!" } if (isset($variable, $another_variable)) { echo "all variables have been declared!"; } else […]

To generate a random integer using php, you can use the php random_int() function. echo random_int(0,100); // Output: 54 Random number generation with php is easy to do. If you want to generate random integers, you can use rand(), but if you want to generate cryptographically secure integers, then you can use the php random_int() […]

In PHP, when you create a new variable or go to use an existing variable, you need to put a dollar sign $ before the variable name. $a = 1 $b = 2 $c = $a + $b Depending on which programming language you use, there can be different conventions around how you can define […]

In php, numerically indexed arrays begin with position 0 because php is a zero-based programming language. $array = array(101,202,303); print_r($array); // Output: Array ( [0] => 101 [1] => 202 [2] => 303 ) Depending on which programming language you use, there are sometimes different conventions and behaviors which you need to know. One such […]

To get the last day of a month, you can use the php date() function and format with “Y-m-t”. “t” returns the last day of a month. echo date('Y-m-t'); echo date('Y-m-t', strtotime('22-04-01')); // Output: 2022-04-30 2022-04-30 When working with date objects in php, the ability to easily change or get information about a specific time […]

To get the days in a month, you can use the php cal_days_in_month() function. echo cal_days_in_month(CAL_GREGORIAN,4,2022); // Output: 30 You can also pass ‘t’ to date() to get the number of days in the current month. echo date('t'); // Output: 30 When working with dates in php, the ability to easily be able to get […]

To add months to a date in php, you can use the strtotime() function as shown below. $today = "2022-04-27"; $one_month_in_future = strtotime($today . "+1 month"); echo date('Y-m-d', $one_month_in_future); //Output: 2022-05-27 You can also use the php date_add() function. $today= date_create("2022-04-27"); $one_month_in_future = date_add($today, date_interval_create_from_date_string("1 month")); echo date_format($one_month_in_future, "Y-m-d"); // Output: 2022-05-27 When working with […]

To get the name of the current month in php, you can use the php date() function and pass “F”. $month_name = date("F"); echo $month_name; // Output: April If you want to get the current month number, you can use the php idate() function and pass ‘m’. $month_number = idate('m'); echo $month_number ; // Output: […]

The php array_walk() function gives us the ability to apply a function to all elements in an array. array_walk() modifies the passed array if the function parameter is passed by reference function square(&$var) { $var = $var * $var; } $array = array(1,2,3,4,5); array_walk($array, "square"); print_r($array); // Output: Array ( [0] => 1 [1] => […]

The php array_map() function gives us the ability to create a new array by applying a function to all elements of one or more arrays. function square($var) { return $var * $var; } $array = array(1,2,3,4,5); print_r(array_map("square", $array)); // Output: Array ( [0] => 1 [1] => 4 [2] => 9 [3] => 16 [4] […]

The php array_slice() function gives us the ability to slice an array and extract elements at specific positions. $array = array('bear', 'elephant', 'rabbit', 'salmon', 'alligator', 'whale'); // Slice array from position 1 to 3 print_r(array_slice($array, 1, 2)); // Output: Array ( [0] => elephant [1] => rabbit ) When working with collections of data in […]

The php array_splice() function gives us the ability to remove elements from an array by their position, insert new elements at a specific position, and replace elements. To remove an element from an array, pass an array and the position of the element you want to remove to array_splice() $array = array('bear', 'elephant', 'rabbit', 'salmon', […]

The php array_filter() function gives us the ability to filter an array with a callback function. You can filter both values and keys with array_filter() function greater_than_5($var) { return $var > 5; } $array = array(1,2,3,4,5,6,7,8,9,10); print_r(array_filter($array, "greater_than_5")); // Output: Array ( [5] => 6 [6] => 7 [7] => 8 [8] => 9 [9] […]

The php array_key_exists() function checks an array to see if a given key exists in that array. $array = array("black" => "bear", "grey" => "elephant", "yellow" => "lion"); var_dump(array_key_exists("black",$array)); // Output: bool(true) When working with arrays in php, it can be valuable to be able to easily gather information of the properties of an array. […]

In php, we can get the word count and number of words in a string with the str_word_count() function. $string = "This is a string"; echo str_word_count($string); // Output: 4 When working with string variables in our code, the ability to easily get information about the variables is valuable. One such piece of information is […]

The php sleep() function gives us the ability to pause the execution of our code. sleep() delays the execution of code by a given number of seconds. sleep(30); // program sleeps for 30 seconds When programming in php, sometimes we want to delay the execution of a piece of code so that other processes can […]

The php is_float() function checks if a variable is a float or not. If the given variable is a float, is_float() returns TRUE. Otherwise, is_float() returns FALSE. $float = 1.0; $array = array(1,2,3); $string = "This is a string"; var_dump(is_float($float)); var_dump(is_float($array)); var_dump(is_float($string)); // Output: bool(true) bool(false) bool(false) When working with different variables in your php […]

The php is_string() function checks if a variable is an string or not. If the given variable is an string, is_string() returns TRUE. Otherwise, is_string() returns FALSE. $string = "This is a string"; $array = array(1,2,3); $float = 1.0; var_dump(is_string($string)); var_dump(is_string($array)); var_dump(is_string($float)); // Output: bool(true) bool(false) bool(false) When working with different variables in your php […]

The php is_array() function checks if a variable is an array or not. If the given variable is an array, is_array() returns TRUE. Otherwise, is_array() returns FALSE. $array = array(1,2,3); $float = 1.0; $string = "This is a string"; var_dump(is_array($array)); var_dump(is_array($float)); var_dump(is_array($string)); // Output: bool(true) bool(false) bool(false) When working with different variables in your php […]

The php array_diff() function allows us to find the elements of an array which are not in all of the other given arrays. $array1 = array(5,3,8,2,1); $array2 = array(9,3,4,2,1); print_r(array_diff($array1,$array2)); // Output: Array ( [0] => 5 [2] => 8 ) When working with multiple arrays, it can be useful to find the entire collection […]

The php array_intersect() function allows us to find the intersection (common elements) of two or more arrays in php. $array1 = array(5,3,8,2,1); $array2 = array(9,3,4,2,1); print_r(array_intersect($array1,$array2)); // Output: Array ( [1] => 3 [3] => 2 [4] => 1 ) When working with multiple arrays, it can be useful to find the entire collection of […]

The php array_fill() function fills an array with n entries of the same given value with keys starting from given starting index. $array = array_fill(0, 5, "item"); print_r($array); // Output: Array ( [0] => item [1] => item [2] => item [3] => item [4] => item ) When working with collections of data in […]

The php array_merge() function allows us to append the items of one or more arrays to the items of a given array. $array1 = array("bear","elephant","lion"); $array2 = array(1,2,3); $array3 = array("orange","red","yellow"); print_r(array_merge($array1,$array2,$array3)); // Output: Array ( [0] => bear [1] => elephant [2] => lion [3] => 1 [4] => 2 [5] => 3 [6] […]

To get the current system IP address in php, we can access the ‘REMOTE_ADDR’ key from the $_SERVER super global variable. $ip_address = $_SERVER['REMOTE_ADDR']; If the client is using a proxy or accessing your page with shared internet, you use the ‘HTTP_X_FORWARDED_FOR’ and ‘HTTP_CLIENT_IP’ keys respectively. $ip_address_proxy = $_SERVER['HTTP_X_FORWARDED_FOR']; $ip_address_shared_internet = $_SERVER['HTTP_CLIENT_IP']; If you are […]

In php, we can get the current location’s latitude and longitude from an address and also get an address from a latitude and longitude by leveraging the Google Maps API. To get the latitude and longitude from an address, you can define a custom php function as shown below. function getLatLong($address){ $formatted_address = str_replace(' ','+',$address); […]

To parse a URL in php, you can use the php parse_url() function and get an array with the URL scheme, host, path, query string, and other information. $url = "http://theprogrammingexpert.com/php-parse-url?user=friend#hello"; print_r(parse_url($url)); //Output: Array ( [scheme] => https [host] => theprogrammingexpert.com [path] => /php-parse-url [query] => user=friend [fragment] => hello ) If you want to […]

To remove all HTML tags from a string in php, the easiest way is to use the strip_tags() function. $string_with_html_tags = "<p>I'm a string with <span>HTML</span>!</p>"; echo strip_tags($string_with_html_tags); //Output: I'm a string with HTML! Keeping Certain HTML Tags and Stripping All Other Tags with strip_tags() in php There is a second optional parameter for the […]

The php array_flip() function interchanges the keys and values of an array, making a new array with keys which are the given array’s values and values which are the given array’s keys. $array = array('bear', 'elephant', 'rabbit'); $flipped_array = array_flip($array1); print_r($array); print_r($flipped_array); // Output: Array ( [0] => bear [1] => elephant [2] => rabbit […]

unset() and unlink() are two very useful php functions. The difference between unset() and unlink() in php is unset() deletes variables and unlink() deletes files. $variable = "I'm a variable"; unset($variable); unlink("./folder/file_name1.txt"); In php, there are many different functions which allow us to create complex programs. Some of the functions have similar names which make […]

The php array_combine() function creates a new array given two arrays, where one array is used for the keys and the other array is used for the values of the new array. $array1 = array('bear', 'elephant', 'rabbit'); $array2 = array(1,2,3); $new_array = array_combine($array1, $array2); print_r($new_array); // Output: Array ( [bear] => 1 [elephant] => 2 […]

To delete a cookie in php, you can use the php setcookie() function with an expiration time which is in the past. It is also good practice to unset the variable with unset() from the $_COOKIE super global variable. setcookie("cookie", "", time() – 3600); unset($_COOKIE["cookie"]); When working with web pages in php, many times we […]

To get the user agent in php, you can use the $_SERVER super global variable and access the key ‘HTTP_USER_AGENT’. $user_agent = $_SERVER['HTTP_USER_AGENT']; The User-Agent request header is a string that lets servers and network peers identify various information like the application, operating system, vendor, and/or version of the requesting user agent. When building web […]

To get the query string from a URL in php, you can use $_GET super global to get specific key value pairs or $_SERVER super global to get the entire string. // http://theprogrammingexpert.com/?key1=value1&key2=value2&key3=value3 echo $_GET['key1']; echo $_GET['key2']; echo $_SERVER['QUERY_STRING']; //Output: value1 value2 key1=value1&key2=value2&key3=value3 A query string is a part of a URL that assigns values […]

When working with sessions in php, you can use the session_destroy() function to destroy all data associated with a current active session by deleting the session file. The session variables will still be available, but will not be connected with the session. session_start(); // do things with your session session_destroy(); If you want to kill […]

To get the session ID in php, you can use the php session_id() function. session_id() returns the session ID if a session is active. session_start(); $session_id = session_id(); If you want to start a session with your own session ID, then you can use session_id() before you start a session with your own ID. session_id($your_id); […]

The php json_encode() function allows us to get the JSON representation of variables. class exampleClass { public $id; private $name; static protected $multiplyNumbers; static function multiplyNumbers($a,$b) { return $a * $b; } } $num = 5; $string = "This is a string"; $array = ["This","is","an","array"]; echo json_encode(new exampleClass) . "\n"; echo json_encode($num). "\n"; echo json_encode($string). […]

The php var_dump() function allows us to print information about the type and value of a variable. $num = 5; $string = "This is a string; $array = ["This","is","an","array"]; var_dump($num, $string, $array); //Output: int(5) string(16) "This is a string" array(4) { [0]=> string(4) "This" [1]=> string(2) "is" [2]=> string(2) "an" [3]=> string(5) "array" } When […]

The php print_r() function allows us to get human-readable information about our php variables. We can print arrays and objects with print_r(). $num = 5; $string = "This is a string"; $array = ["This","is","an","array"]; print_r($num); print_r($string); print_r($array); //Output: 5 This is a string Array ( [0] => This [1] => is [2] => an [3] […]

When working in php, we can print an array easily. To print arrays, you can use loops, print_r(), var_dump(), or json_encode(). The first example here shows how to print all the elements in an array with a loop. $array = ["This","is","an","array"]; foreach($array as $ele) { echo $ele . "\n"; } //Output: This is an array […]

In php, a switch case statement tests a variable against multiple values and when the switch statement finds a match, it executes code in the case block. $variable = "apple"; switch($variable) { case "apple": echo "The variable is apple."; break; case "banana": echo "The variable is banana."; break; default: echo "The variable is something else."; […]

With the php range() function, we can create arrays of elements in a range of numbers and letters. $arr = range(0,10); print_r($arr); //Output: Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 […]

The php str_split() function allows us to convert a string into an array of equal length substrings. By default, str_split() splits a string into an array of the string’s characters. $variable = "I'm a variable"; print_r(str_split($variable)); //Output: Array ( [0] => I [1] => ' [2] => m [3] => [4] => a [5] => […]

In php, the strlen() function allows us to get number of characters and length of a string variable. $variable = "I'm a variable"; echo strlen($variable); //Output: 14 When working with string variables in our php programs, it is useful to be able to easily extract information about the values of the strings. In php, we […]

In php, we can get the length of an array easiest with the php count() function. $array = array(1, 2, 3, 4, 5); echo count($array); // Output: 5 When working with arrays in php, it can be valuable to be able to easily gather information of the properties of an array. One such situation is […]

The php array_shift() function allows us to get and delete the first element of an array in php. $array = array(1, 2, 3, 4, 5); array_shift($array); print_r($array); // Output: Array ( [0] => 2 [1] => 3 [2] => 4 [3] => 5 ) When working with arrays and collections of data in php, it […]

The php array_pop() function allows us to get and delete the last element of an array in php. $array = array(1, 2, 3, 4, 5); array_pop($array); print_r($array); // Output: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) When working with arrays and collections of data in php, it […]

To truncate a string variable in php, the easiest way is to use the php substr() function. $variable = "this is a variable"; $truncated = substr($variable,0,6); echo $truncated; //Output: this i Another way to truncate a string is with the mb_strimwidth() function. $variable = "this is a variable"; $truncated = mb_strimwidth($variable,0,6); echo $truncated; //Output: this […]

In php, to remove duplicates from an array, the easiest way is to use the array_unique() function to get the unique values and then use array_values() to reindex the array. $example = array(1,2,4,7,5,4,1,2,3,3,3,4,4,5,5,5,6); print_r(array_values(array_unique($example))); //Output: Array ( [0] => 1 [1] => 2 [2] => 4 [3] => 7 [4] => 5 [5] => 3 […]

To reverse an array in php without a function, we can use a loop and swap items in order. $example = array("lion", "bear", "snake", "horse"); foreach(range(0,count($example)/2) as $i) { [$example[$i], $example[count($example) – $i – 1]] = [$example[count($example) – $i – 1],$example[$i]]; } print_r($example); //Output: Array ( [0] => horse [1] => snake [2] => bear […]

In php, you can reverse the items in an array easiest with the array_reverse() function. $example = array("lion", "bear", "snake", "horse"); $reversed = array_reverse($example); print_r($reversed); //Output: Array ( [0] => horse [1] => snake [2] => bear [3] => lion ) When working with arrays and collections of data in php, it is useful to […]

In php, we can add items to arrays easily. If you want to add items to the end of an array, you can use the php array_push() function. $example = array("lion"); array_push($example, "bear", "snake", "horse"); print_r($example); //Output: Array ( [0] => lion [1] => bear [2] => snake [3] => horse ) If you want […]

In php, there are three ways you can create an empty array. Creating an empty array can be useful if your data is dynamic. $emptyArray = []; $emptyArray = array(); $emptyArray = (array) null When working with arrays and collections of data in php, it is useful to be able to create and use different […]

In php, the rtrim() function is very useful if we have strings with unwanted whitespace. With the php rtrim() function, we can remove whitespace from the end of a string. $variable = " this is a variable "; echo rtrim($variable); //Output: this is a variable When working with string variables in our php programs, it […]

In php, the trim() function is very useful if we have strings with unwanted whitespace. With the php trim() function, we can remove whitespace from the beginning and end of a string. $variable = " this is a variable "; echo trim($variable); //Output: this is a string variable When working with string variables in our […]

In php, we can capitalize the first letter of a string easily with the php ucfirst() function. $variable = "this is a string variable"; echo ucfirst($variable); //Output: This is a string variable When working with string variables in our php programs, it is useful to be able to easily manipulate and change the value of […]

In php, we can make all characters in a string lowercase easily with the php strtolower() function. $variable = "THIS IS A STRING VARIABLE"; echo strtolower($variable); //Output: this is a string variable When working with string variables in our php programs, it is useful to be able to easily manipulate and change the value of […]

In php, we can make all characters in a string uppercase easily with the php strtoupper() function. $variable = "this is a string variable"; echo strtoupper($variable); //Output: THIS IS A STRING VARIABLE When working with string variables in our php programs, it is useful to be able to easily manipulate and change the value of […]

To check if a string ends with a particular string in php, for users of php 8.0.0 or later, the easiest way is to use the php str_ends_with() function. $variable = "I'm a variable"; echo var_dump(str_ends_with($variable, "I'm")); echo var_dump(str_ends_with($variable, "a variable")); echo var_dump(str_ends_with($variable, "variable")); //Output: bool(false) bool(true) bool(true) If you are using a version of […]

To check if a string starts with a particular string in php, for users of php 8.0.0 or later, the easiest way is to use the php str_starts_with() function. $variable = "I'm a variable"; echo var_dump(str_starts_with($variable, "I'm")); echo var_dump(str_starts_with($variable, "I'm a")); echo var_dump(str_starts_with($variable, "variable")); //Output: bool(true) bool(true) bool(false) If you are using a version of […]

The php unset() function destroys one or more variables. We can use unset() to delete previously declared variables. $variable = "I'm a variable"; echo var_dump(isset($variable)); unset($variable); echo var_dump(isset($variable)); //Output: bool(true) bool(false) When working with variables in our php programs, it is useful to be able to delete a variable. In php, the unset() function allows […]

In php, we can check if a function exists with the php function_exists() function. if (function_exists('max')) { echo "max() exists!"; } else { echo "max() doesn't exist!"; } if (function_exists('other_function')) { echo "other_function() exists!"; } else { echo "other_function() doesn't exist!"; } //Output: max() exists! other_function() doesn't exist! When working in php, it is useful […]

The isset() function in php allows us to check if one or more variables have been declared to and is not null. $variable = "I'm a variable"; if (isset($variable)) { echo "variable has been declared!"; } else { echo "variable hasn't been declared!" } if (isset($variable, $another_variable)) { echo "all variables have been declared!"; } […]

In php, we can check if a variable exists with the php isset() function. $variable = "I'm a variable"; if (isset($variable)) { echo "variable exists!"; } else { echo "variable doesn't exist!" } //Output: variable exists! When working with variables in our php programs, it is useful to be able to check if a variable […]

In php, we can check if a property exists in a class or an object with the built-in php property_exists() function. class exampleClass { public $id; private $name; static protected $multiplyNumbers; static function multiplyNumbers($a,$b) { return $a * $b; } } var_dump(property_exists('exampleClass', 'name')); var_dump(property_exists(new exampleClass, 'name')); var_dump(property_exists('exampleClass', 'multiplyNumbers')); var_dump(property_exists('exampleClass', 'other')); // Output: bool(true) bool(true) bool(true) […]

To remove a string from another string variable in php, the easiest way is to use the php str_replace() function. $string = "This is a string."; $string_without_his = str_replace("his","", $string); echo $string_without_his; // Output: T is a string. You can also use the preg_replace() function to use regex to remove strings from string variables in […]

To remove a specific character from a string variable in php, the easiest way is to use the php str_replace() function. $string = "This is a string."; $string_without_i = str_replace("i","", $string); echo $string_without_i; // Output: Ths s a strng. You can also use the preg_replace() function to use regex to remove characters from a string […]

To replace a space with a dash in php, the easiest way is to use the php str_replace() function. $string_with_underscores = "This_is_a_string."; $string_with_spaces = str_replace("_"," ", $string_with_underscores); echo $string_with_spaces; // Output: This is a string. You can also use the preg_replace() function to use regex to replace underscores with spaces in php. $string_with_underscores = "This_is_a_string."; […]

To replace a space with a dash in php, the easiest way is to use the php str_replace() function. $string_with_spaces = "This is a string."; $string_with_dashes = str_replace(" ","-", $string_with_spaces); echo $string_with_dashes; // Output: This-is-a-string. You can also use the preg_replace() function to use regex to replace spaces with dashes in php. $string_with_spaces = "This […]

To get the last element of an array in php, the easiest way is with the end() function. $array = array(1, 2, 3, 4, 5); echo end($array); // Output: 5 Another way to get the last element of an array is with the array_slice() function. $array = array(1, 2, 3, 4, 5); echo array_slice($array, -1)[0]; […]

To get the first element of an array in php, the easiest way is by accessing the first element directly. $array = array(1, 2, 3, 4, 5); echo $array[0]; // Output: 1 Another way to get the first element of an array is with the current() function. $array = array(1, 2, 3, 4, 5); echo […]

To remove the first character from a string in php, the easiest way is with php substr() function. $string = "This is a string variable"; $string_without_first_char = substr($string,1); echo $string_without_first_char; // Output: his is a string variable You can also use the php ltrim() function. $string = "This is a string variable"; $string_without_first_char = ltrim($string,$string[0]); […]

To remove the last character from a string in php, the easiest way is with php substr() function. $string = "This is a string variable"; $string_without_last_char = substr($string,0,-1); echo $string_without_last_char; // Output: This is a string variabl You can also use the php rtrim() function. $string = "This is a string variable"; $string_without_last_char = rtrim($string,$string[-1]); […]

To get the value of Euler’s Constant e in php, the easiest way is to use the php constant M_E. M_E returns the value 2.718281828459. echo M_E; // 2.718281828459 You can also use the php exp() function. exp(1) returns the value 2.718281828459. echo exp(1); // 2.718281828459 In php, we can easily get the value of […]

In php, we can easily do trigonometry with the many trig functions from the php math functions. In this article, you will learn about all the trigonometric functions that you can use in php to perform trigonometry easily. In php, we can easily use trigonometric functions with the help of the php math functions. The […]

To convert degrees to radians for use in trigonometric functions in php, the easiest way is with the php deg2rad() function. $radians = deg2rad(60) The php collection of math functions has many powerful functions which make performing certain calculations in php very easy. One such calculation which is very easy to perform in php is […]

To convert radians to degrees for use in trigonometric functions in php, the easiest way is with the php rad2deg() function. $degrees = rad2deg(pi()/2) The php collection of math functions has many powerful functions which make performing certain calculations in php very easy. One such calculation which is very easy to perform in php is […]

To get the value of pi in php, the easiest way is use the php pi() function. pi() returns the value 3.1415926535898. echo pi(); // 3.1415926535898 You can also use the php constant M_PI echo M_PI; // 3.1415926535898 In php, we can easily get the value of pi for use in trigonometry with the php […]

To find the arctangent, or inverse tangent, of the quotient of two numbers, we can use the php atan2() function. atan2(x,y) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily. php gives us the ability to find the arctangent […]

To find the arctangent, or inverse tangent, of a number, we can use the php atan() function. atan(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily. To find the arctangent of a number, we use the php atan() […]

To find the tangent of a number (in radians), we can use the php tan() function. tan(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily. To find the tangent of a number, in radians, we use the php […]

To find the cosine of a number (in radians), we can use the php cos() function. cos(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily. To find the cosine of a number, in radians, we use the php […]

To find the arccosine, or inverse cosine, of a number, we can use the php acos() function. acos(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily. To find the arccosine of a number, we use the php acos() […]

To find the hyperbolic arctangent of a number, we can use the php atanh() function. atanh(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily and in addition to the standard trigonometry, we have access to the hyperbolic trigonometry […]

To find the hyperbolic tangent of a number, we can use the php tanh() function. tanh(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily and in addition to the standard trigonometry, we have access to the hyperbolic trigonometry […]

To find the hyperbolic arccosine of a number, we can use the php acosh() function. acosh(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily and in addition to the standard trigonometry, we have access to the hyperbolic trigonometry […]

To find the hyperbolic cosine of a number, we can use the php cosh() function. cosh(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily and in addition to the standard trigonometry, we have access to the hyperbolic trigonometry […]

To find the hyperbolic arcsine of a number, we can use the php asinh() function. asinh(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily and in addition to the standard trigonometry, we have access to the hyperbolic trigonometry […]

To find the hyperbolic sine of a number, we can use the php sinh() function. sinh(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily and in addition to the standard trigonometry, we have access to the hyperbolic trigonometry […]

To find the arcsine, or inverse sine, of a number, we can use the php asin() function. asin(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily. To find the arcsine of a number, we use the php asin() […]

To find the sine of a number (in radians), we can use the php sin() function. sin(x) In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily. To find the sine of a number, in radians, we use the php […]

To find the floor of a number using php, the easiest way is to use the php floor() function. echo floor(2.434); // Output: 2 Finding the floor of a number in php is easy. We can round down numbers to the nearest integer with the php floor() function. echo floor(5.4); // Output: 5 We can […]

To find the ceiling of a number using php, the easiest way is to use the php ceil() function. echo ceil(2.434); // Output: 3 Finding the ceiling of a number in php is easy. We can round up numbers to the nearest integer with the php ceil() function. echo ceil(5.4); // Output: 6 We can […]

To delete a file using php, the easiest way is to use the php unlink() function. unlink("./folder/file_name1.txt"); Deleting files with php is easy. We can use the php unlink() function to delete files If we want to delete a file named “file_name.txt”, we can do this with the following php code: unlink("./folder/file_name.txt"); Deleting Multiple Files […]

To copy a file using php, the easiest way is to use the php copy() function. copy("./folder/file_name1.txt","./folder/file_name2.txt"); Copying files with php is easy. We can use the php copy() function to copy files. If we want to copy a file named “file_name.txt” to “copied_file_name.txt”, we can do this with the following php code: copy("./folder/file_name.txt","./folder/copied_file_name.txt"); One […]

To rename a file from one name to another using php, the easiest way is to use the php rename() function. rename("./folder/file_name1.txt","./folder/file_name2.txt"); Renaming files with php is easy. We can use the php rename() function to rename files and rename directories. If we want to rename a file named “old_file_name.txt” to “new_file_name.txt”, we can do […]

To move a file from one directory to another using php, the easiest way is to use the php rename() function. rename("./folder1/file.txt","./folder2/file.txt"); Moving files with php is easy. We can use the php rename() function to move a file into a different folder or directory. If we want to move a file named “file.txt” from […]

To check if a variable is a number and is numeric in php, the easiest way is to use the php is_numeric() function. if (is_numeric("31")) { echo "True"; } else { echo "False"; } // Output: True if (is_numeric(1.3)) { echo "True"; } else { echo "False"; } // Output: True if (is_numeric("php")) { echo […]

To generate a random number using php, the simplest way is to use the php rand() function: echo rand(); // Output: 1123 echo rand(0,10); // Output: 3 Random number generation with php is easy to do. All we need is the php rand() method. The php rand() method generates random integers. There are two ways […]

To get the image height, image width, and image file type in php, we can use the php getimagesize() function. $image_information = getimagesize("sample_image.png"); print_r($image_information); // Output: Array ( [0] => 500 [1] => 250 [2] => 3 [3] => width="500" height="250" [bits] => 8 [mime] => image/png ) Many times when designing web pages, we […]

To find the square root of a number in php, the easiest way is with the php sqrt() function. echo sqrt(4); // Output: 2 Finding the square root of a number in php is easy. We can find the square root of both integers and floats using the php sqrt() function. In mathematics, the square […]

To find the absolute value of a number in php, the easiest way is with the php abs() function. echo abs(-4); // Output: 4 Finding the absolute value of a number in php is easy. We can find the absolute number of both integers and floats using the php abs() function. The absolute value of […]

You can use the php preg_match_all() function to perform a regular expression (regex) search on a string, and return all matches of the regex pattern found. $sample_string = "This is a string with some words and 1 number."; $pattern = '/(?<!\S)\S{1}(?!\S)/'; // Searching for all 1 letter words preg_match_all($pattern,$sample_string, $matches); print_r($matches); Array ( [0] => […]

You can use the php preg_match() function to perform a regular expression (regex) search on a string, and return if a match of the regex pattern found, and find out what the first match is. $sample_string = "This is a string with some words."; $pattern = '/(?<!\S)\S{1}(?!\S)/'; // Searching for all 1 letter words echo […]

You can use the php preg_replace() function to perform a regular expression (regex) search on a string or array of strings, and returns a string or an array of strings where all matches of the regex pattern or list of regex patterns found are replaced with substrings. $old_string = "This is a string with too […]

php echo is one of the most used constructs in php. The echo is not a function, but a language construct and allows us as php programmers to output one or more strings. echo "Hello World!"; // Output: Hello World! The php echo statement is one of the most used and most useful statements in […]

You can use the php str_replace() function to replace strings in a string or an array of strings with a replacement string in the following way: $old_string = "This is the old string"; $new_string = str_replace("old","new",$old_string); echo $new_string; // "This is the new string" From the php documentation, the php str_replace() function takes 4 parameters: […]

To find the maximum value of an array in php, we can use the php max() function. $max = max($values) The max function returns the “highest” value according to standard comparisons in php. If there are multiple values which have the same value, then the first one will be returned. To get the maximum of […]

To find the minimum value of an array in php, we can use the php min() function. $min = min($values) The min function returns the “lowest” value according to standard comparisons in php. If there are multiple values which have the same value, then the first one will be returned. To get the minimum of […]

The php in_array() function allows us to check if a value is in a php array. The php in_array() function returns true if the value is in the array, and false if the value is not in the array. From the php documentation, the php in_array() function takes 3 parameters: in_array(mixed $needle, array $haystack, bool $strict = […]

Creating a custom category.php page with pagination in WordPress is very useful when we want to put additional content on our category pages. The code below is an example of how you can create a custom category.php page with pagination in WordPress. <?php get_header(); ?> <?php $article = get_term(get_queried_object()->term_id, 'category'); $category_name = $article->slug; $paged = […]

PHP provides the strpos() function to check if a string contains a specific substring or not. The strpos() function returns the position of the first occurrence of a substring in a string. If substring not found, it will return false. For example, let’s say you were checking the string “I love to program” to see […]