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@ 2017-07-05T16:09:07Z

<?php

for ($i = 0; $i < 100000; $i++) {
    if (function_exists('mb_substr')) {
        
    }
}

Output
Performance
VLD
References
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function_exists: documentation ( source)

preferences:dark modelive preview

49.86 ms | 402 KiB | 5 Q