How to replace the part of a string with another string in PHP

Use the PHP str_replace() function

You can use the PHP str_replace() function to find and replace any portion of a string with another string. In the following example the substring "quick brown fox" of the string $my_str is replaced by the string "swift white cat". Let's try it out and see how it works:

<?php
$my_str = "The quick brown fox jumps over the lazy dog.";
 
// Display replaced string
echo str_replace("quick brown fox", "swift white cat", $my_str);
?>