PHP Handbuch
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# preg_replace_callback

(PHP 4 >= 4.0.5)

preg_replace_callback -- Perform a regular expression search and replace using a callback

## Description

mixed preg_replace_callback ( mixed pattern, mixed callback, mixed subject [, int limit])

The behavior of this function is almost identical to preg_replace(), except for the fact that instead of `replacement` parameter, one should specify a `callback` that will be called and passed an array of matched elements in the subject string. The callback should return the replacement string. This function was added in PHP 4.0.5.

See also preg_replace().

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