Replace Underscore with Space in php 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.";

$string_with_spaces = preg_replace("/_+/"," ", $string_with_underscores);

echo $string_with_spaces;

// Output:
This is a string.

When working with strings in php, being able to manipulate your variables easily is important. There are a number of built in string methods which allow us to get information and change string variables.

One such function which is very useful is the string str_replace() function. With the php str_replace() function, we can create a new string where the specified value is replaced by another specified value.

We can use the str_replace() function to replace the underscores in a string with spaces.

To replace underscores with spaces, we can use the str_replace() function as shown in the following php code.

$string_with_underscores = "This_is_a_string.";

$string_with_spaces = str_replace("_"," ", $string_with_underscores);

echo $string_with_spaces;

// Output:
This is a string.

To replace spaces with underscores, just change the arguments to str_replace().

$string_with_spaces = "This is a string.";

$string_with_underscores = str_replace(" ","_", $string_with_spaces);

echo $string_with_underscores;

// Output:
This_is_a_string.

Replacing Spaces with Underscores in php with preg_replace()

Another function we can use to replace spaces with underscores in a php string is the php preg_replace() function.

preg_replace() performs 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.

Below is an example of how to replace underscores with spaces using preg_replace() in php.

$string_with_underscores = "This_is_a_string.";

$string_with_spaces = preg_replace("/_+/"," ", $string_with_underscores);

echo $string_with_spaces;

// Output:
This is a string.

Using the str_replace() function to Make Replacements in Strings in php

Below are a few more examples of how you can use the str_replace() function to make replacements in strings in php.

For example, if we want to replace spaces with dashes, we can do the following.

$string_with_spaces = "This is a string.";

$string_with_dashes = str_replace(" ","-", $string_with_spaces);

echo $string_with_dashes;

// Output:
This-is-a-string.

If we want to replace all the spaces with periods, we can do so easily in the following php code.

$string_with_spaces = "This is a string.";

$string_with_periods = str_replace(" ",".", $string_with_spaces);

echo $string_with_periods;

// Output:
This_is_a_string.

You can also replace full words with other words. Let’s replace the word “a” with “the”.

$string_with_spaces = "This is a string.";

$string_with_the = str_replace("a","the", $string_with_spaces);

echo $string_with_the;

// Output:
This is the string.

Hopefully this article has been useful for you to learn how to replace underscores with spaces in php.