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@ 2014-06-30T09:40:24Z

<?php

$file = 'opto_213.12_3';
$file = explode('.',$file);
$file = end(explode('_',$file[0]));

Output
Performance
VLD
References
Branches

end: documentation ( source)
explode: documentation ( source)

preferences:dark modelive preview

42.59 ms | 402 KiB | 5 Q