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@ 2013-08-16T13:49:50Z

<?php

for ($i = 0; $i < 1000; $i++) {
    strtolower('a') === strtolower('a');
}

Output
Performance
VLD
References
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strtolower: documentation ( source)

preferences:dark modelive preview

42.72 ms | 402 KiB | 5 Q