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<?php function luhn_validate($num) { $sum = 0; for($i=0; $i<strlen($num); $i++) { if($i & 1) { // odd $sum += (int)$num[$i]*2-9; } else { // even $sum += (int)$num[$i]; } } return (is_integer($sum / 10 )) ? true : false; } var_dump(luhn_validate('4111888888881881')); var_dump(luhn_validate('15616516516165165'));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false)

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