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How to replace String in PHP ?

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In this article, we are going to replace the String with another by using the PHP built-in str_replace() function.

A String is a collection of characters. The str_replace() is a built-in function in PHP and is used to replace all the occurrences of the search string or array of search strings by a replacement string or array of replacement strings in the given string or array respectively. We can replace the string with another by using PHP str_replace(). This method is case-sensitive, so the programmer has to take care of the case while programming and interpreting the output.

Syntax:

str_replace(substring,new_replaced_string,original_string);

We need to provide three parameters.

  • substring is the string present in the original string that should be replaced
  • replaced_string is the new string that replaces the substring.
  • original_string is the input string.

Example 1: The following code replaces the string with another string.

PHP

<?php
//input string
$string="Geeks for Geeks";
//replace geeks in the string with computer
echo str_replace("Geeks","computer",$string);
?>

                    

Output:

computer for computer

Example 2: The following code replaces the string with empty.

PHP

<?php
//input string
$string="Geeks for Geeks";
//replace geeks in the string with empty
echo str_replace("Geeks","",$string);
?>

                    

Output:

for

Example 3: The following code replaces the string with integers.

PHP

<?php
//input string
$string="Geeks for Geeks";
//replace geeks in the string with value - 1
echo str_replace("Geeks",1,$string);
?>

                    

Output:

1 for 1


Last Updated : 31 May, 2023
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