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@ 2016-09-15T18:42:07Z

<?php

    $arr = [
        'a',
        'b',
        'c'
    ];

    while($letter=key($arr)) {
        echo $letter;
        next($arr);
    }

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

preferences:dark modelive preview

56.02 ms | 402 KiB | 5 Q