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@ 2016-11-03T14:21:56Z

<?php

$start = microtime(true);

for ($i = 1 ; $i <=1000 ; $i++) {
    isset($dupa);
}
var_dump(microtime(true) - $start);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
microtime: documentation ( source)

preferences:dark modelive preview

38.9 ms | 402 KiB | 5 Q