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@ 2014-09-23T18:52:45Z

<?php

$placeholders = array_map(function($key) {

             return sprintf(':%s', $key);
        }, $keys);

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

45.24 ms | 402 KiB | 5 Q