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@ 2016-04-26T13:02:26Z

<?php

$arr = [1, 2, 3, 4, 5, 6, 7];
echo key($arr).PHP_EOL;
next($arr);
echo key($arr).PHP_EOL;

Output
Performance
VLD
References
Branches

key: documentation ( source)
next: documentation ( source)

preferences:dark modelive preview

63.64 ms | 402 KiB | 5 Q