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@ 2016-10-29T13:52:49Z

<?php

$array = [2,3,4,5];

$index = "a";
$arrayB = array_map(function ($element) {
    $index++;
    return array($index => $element);
}, $array);

print_r($arrayB);

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

57.71 ms | 402 KiB | 5 Q