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@ 2013-11-02T17:46:25Z

<?php
$string="M";
$strig="";
$strg="";
$stg="";
$last=array($strig,$strg,$string,$stg);
echo Implode($last,"");
foreach ($last as $i=>$value){
switch($last[$i]) {
        case 'k':
        case 'K':
            echo "k";
            break;
        case 'm':
        case 'M':
         echo "k";

            break;
        default:
            echo "o";
    }
}
?>

Output
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implode: documentation ( source)

preferences:dark modelive preview

41.78 ms | 402 KiB | 5 Q