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PHP str_ireplace() Function

❮ PHP String Reference


Replace the characters "WORLD" (case-insensitive) in the string "Hello world!" with "Peter":

echo str_ireplace("WORLD","Peter","Hello world!");
Try it Yourself »

Definition and Usage

The str_ireplace() function replaces some characters with some other characters in a string.

This function works by the following rules:

  • If the string to be searched is an array, it returns an array
  • If the string to be searched is an array, find and replace is performed with every array element
  • If both find and replace are arrays, and replace has fewer elements than find, an empty string will be used as replace
  • If find is an array and replace is a string, the replace string will be used for every find value

Note: This function is case-insensitive. Use the str_replace() function to perform a case-sensitive search.

Note: This function is binary-safe.



Parameter Values

Parameter Description
find Required. Specifies the value to find
replace Required. Specifies the value to replace the value in find
string Required. Specifies the string to be searched
count Optional. A variable that counts the number of replacements

Technical Details

Return Value: Returns a string or an array with the replaced values
PHP Version: 5+
Changelog: The count parameter was added in PHP 5.0

More Examples


Using str_ireplace() with an array and a count variable:

$arr = array("blue","red","green","yellow");
print_r(str_ireplace("RED","pink",$arr,$i)); // This function is case-insensitive
echo "Replacements: $i";
Try it Yourself »


Using str_ireplace() with fewer elements in replace than find:

$find = array("HELLO","WORLD");
$replace = array("B");
$arr = array("Hello","world","!");
Try it Yourself »

❮ PHP String Reference