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@ 2014-10-02T14:52:08Z

<?php

$str = '4111111111111111';
//$str = '4556494730120644';
$str = 'xxxxxxxxxxxx1111';
$sKey =  '8519293193919192153';
		$s = '';
		$j = 0;

		for($i=0;$i < strlen($str);$i++)
		{
			$s .= chr( ord(substr($str,$i,1)) + ord(substr($sKey,$j++,1)));
			if($j==strlen($sKey))
				$j=0;
		}
		;

echo $s; 
echo "\n";

echo utf8_encode($s);

Output
Performance
VLD
References
Branches

substr: documentation ( source)
chr: documentation ( source)
utf8_encode: documentation ( source)
ord: documentation ( source)

preferences:dark modelive preview

54.05 ms | 402 KiB | 5 Q