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This function check if the number is a valid luhn
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| <?php | |
| /** | |
| * @param string $val | |
| * @return bool | |
| */ | |
| function checkIsValidLuhn($val) | |
| { | |
| $i = 0; | |
| $arr = str_split($val); | |
| $arr = array_reverse($arr); | |
| foreach ($arr as &$value) { | |
| $i++; | |
| if (($i % 2) == 0) { | |
| $value = $value * 2; | |
| if ($value > 9) { | |
| $arr_s = str_split($value); | |
| $value = array_sum($arr_s); | |
| } else { | |
| $value = $value; | |
| } | |
| } | |
| } | |
| if ((array_sum($arr) % 10) === 0) { | |
| echo ('code is valid'); | |
| return true; | |
| } else { | |
| echo ('code is not valid'); | |
| return false; | |
| } | |
| } |
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