How to remove white space from a string in PHP?

Here the PHP trim() function is used to remove the white space.

     The PHP trim() function is used to remove whitespace including non-breaking spaces, newlines, and tabs from the beginning and end of the string.
The whitespace which occurs in the middle of the string cannot be removed.

For example:

<?php
$my_str = ' Welcome to Tutorial Republic ';
echo strlen($my_str); // Outputs: 33
 
$trimmed_str = trim($my_str);
echo strlen($trimmed_str); // Outputs: 28
?>