PHP 8 reference · String Functions

PHP str_ireplace() Function

Replace every occurrence of a search string, ignoring upper and lower case. Otherwise works like str_replace().

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Syntax

str_ireplace(array|string $search, array|string $replace, string|array $subject, int &$count = null): string|array

Parameter	Description
`search`	The value(s) to find, in any case.
`replace`	The replacement(s).
`subject`	The string or array to search in.
`count` optional	Set to the number of replacements.

The string (or array) with replacements made.

Fix capitalizationTry it yourself

<?php
echo str_ireplace("php", "PHP", "php is fun. Php is fast."), "\n";

Output

PHP is fun. PHP is fast.

Mask words in any caseTry it yourself

<?php
$comment = "This is SPAM and more Spam";
echo str_ireplace("spam", "***", $comment), "\n";

Output

This is *** and more ***

Version	Change
PHP 5.0	Added

str_replace() · Replace every occurrence of a search string with a replacement. Accepts arrays to make several replacements at once.
stripos() · Find the position of the first occurrence of a substring, ignoring case. Returns false when there's no match.
PHP Strings · tutorial