PHP preg_replace_callback

The preg_replace_callback() function is an under-utilized and little documented PHP function that you will find useful and powerful in many situations, especially if you have been actively using preg_match() and preg_replace().

<?php
echo $t1 = 'Lorem ipsum <insert>130</insert> dolor sit amet, adipiscing <insert>150</insert> elit.';

function fReplace($matches)
{
	echo '<pre>';
	print_r($matches);
	echo '</pre>';
	return $matches[0] = '<b>INSERT TEXT</b>';
}
echo preg_replace_callback('/<insert>.*?</insert>/siu','fReplace',$t1);
?>

IN => Lorem ipsum <insert>130</insert> dolor sit amet, adipiscing <insert>180</insert> elit.

OUT => Lorem ipsum INSERT TEXT dolor sit amet, adipiscing INSERT TEXT elit.

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