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@ 2014-08-18T15:30:53Z

<?php

$pattern = '#\d+#';
$haystack = '0123 456 789';

preg_replace_callback($pattern, 'add_three', $haystack);

function add_three($matches){
	return '777';
}

Output
Performance
VLD
References
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preg_replace_callback: documentation ( source)

preferences:dark modelive preview

36.5 ms | 402 KiB | 5 Q