PHP Manual
PCRE Functions
Perform a regular expression search and replace using callbacks

preg_replace_callback_array

(PHP 7)

preg_replace_callback_array — Perform a regular expression search and replace using callbacks

Description

preg_replace_callback_array ( array $pattern , string|array $subject [, int $limit = -1 [, int &$count = NULL [, int $flags = 0 ]]] ) : string|array|null

The behavior of this function is similar to preg_replace_callback(), except that callbacks are executed on a per-pattern basis.

Parameters

pattern: An associative array mapping patterns (keys) to callables (values).
subject: The string or an array with strings to search and replace.
limit: The maximum possible replacements for each pattern in each subject string. Defaults to -1 (no limit).
count: If specified, this variable will be filled with the number of replacements done.
flags: flags can be a combination of the PREG_OFFSET_CAPTURE and PREG_UNMATCHED_AS_NULL flags, which influence the format of the matches array. See the description in preg_match() for more details.

Return Values

preg_replace_callback_array() returns an array if the subject parameter is an array, or a string otherwise. On errors the return value is NULL

If matches are found, the new subject will be returned, otherwise subject will be returned unchanged.

Changelog

Version	Description
7.4.0	The `flags` parameter was added.

Examples

Example #1 preg_replace_callback_array() example

<?php$subject = 'Aaaaaa Bbb';preg_replace_callback_array( [ '~[a]+~i' => function ($match) { echo strlen($match[0]), ' matches for "a" found', PHP_EOL; }, '~[b]+~i' => function ($match) { echo strlen($match[0]), ' matches for "b" found', PHP_EOL; } ], $subject);?>

The above example will output:

6 matches for "a" found
3 matches for "b" found

Php/docs/function.preg-replace-callback-array

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