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@ 2013-12-10T22:39:58Z

<?php


function cast($val) { 
    if (is_numeric($val)) { 
        return $val + 0; 
    }

    //return 0;
    return $val;
} 

$arr = ['stri33ng123', 84, 76.7, '45.6', '67.5e45', '56,9'];

foreach($arr as $a) {
var_dump(cast($a));

}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_numeric: documentation ( source)

preferences:dark modelive preview

42.1 ms | 402 KiB | 5 Q