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@ 2013-05-22T05:16:26Z

<?php
function format(&$collection) {
    foreach($collection as $k => $v) {
        print_r($collection);
        $collection["prefix_{$k}"]  = $v;
    }
}
$collection = array('a' => 1, 'b' => 2, 'c' => 3);
format($collection);
var_dump($collection);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

35.52 ms | 402 KiB | 5 Q