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@ 2016-06-02T06:04:47Z

<?php

function seek(&$arr, $key, $strict = false){
    $offset = 0;
    while(
        $strict ?
        key($arr) !== $key :
        key($arr) != $key
    ){
        next($arr);
        $offset++;
    }
    return $offset;
}

$arr = [
    'a' => 10,
    'b' => 11,
    'c' => 12,
    'd' => 13,
    'e' => 14,
];

$offset = seek($arr, 'c');
var_dump($offset);
var_dump(key($arr));
var_dump(current($arr));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
key: documentation ( source)
next: documentation ( source)
current: documentation ( source)

preferences:dark modelive preview

52.5 ms | 402 KiB | 5 Q