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@ 2015-03-03T12:56:24Z

<?php

$array = [];
// make some array for testing
for($i=0; $i < 100; $i++)
    $array["key$i"] = $i;

for($i=0; $i < 1000000; $i++) {
    reset($array);
    $firstKey = key($array);
}

Output
Performance
VLD
References
Branches

reset: documentation ( source)
key: documentation ( source)

preferences:dark modelive preview

45.75 ms | 402 KiB | 5 Q