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@ 2013-12-30T10:29:37Z

<?php
$selfTable = 'songs';
$relTable  = 'artists';

$strings = array(
    'id',
    'artists.name',
    '$artist.real_name',
    '$title'
);

foreach($strings as $string) {
	echo preg_replace_callback('#([^\.\$]+|\$[\w]+|\$[\w]+\.[\w]+)#', function($match) {
		print_r($match);
    }, $string);
}

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

54.11 ms | 402 KiB | 5 Q