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@ 2014-03-26T14:17:51Z

<?php
function func($input) {
    static $count = 0;
    echo (++$count);
    return preg_replace_callback('/YO\_\{(.*?)\}/s', 'func', $input);
}

$input = <<<'EOD'
YO_{
    YO_{
        YO_{
            McDonalds.
        }
    }
}
EOD;

echo func($input);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)

preferences:dark modelive preview

31.33 ms | 402 KiB | 5 Q