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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, callback 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.

See also preg_replace().

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