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@ 2014-08-15T12:18:16Z

<?php

preg_match('^.*(\d+).*$', 'Осталось всего 2', $roomsLeftMatches);
$left = isset($roomsLeftMatches[1]) ? $roomsLeftMatches[1] : null;
var_dump($left);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

33.86 ms | 402 KiB | 5 Q