PHP Verify that the credit card number is correct function _php tutorial

PHP verifies that the credit card number is the correct function

This article mainly introduces the PHP verification credit card number is the correct function, this article directly give implementation code, the need for friends can refer to the next

You can use the following PHP functions to verify whether a card number is a credit card:

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Function Validatecard ($cardnumber) { $cardnumber = preg_replace ("/\d|\ s/"," ", $cardnumber); # Strip any non-digits $cardlength = strlen ($cardnumber); if ($cardlength! = 0) { $parity = $cardlength% 2; $sum = 0; for ($i = 0; $i < $cardlength; $i + +) { $digit = $cardnumber [$i]; if ($i% = = = $parity) $digit = $digit * 2; If ($digit > 9) $digit = $digit-9; $sum = $sum + $digit; } $valid = ($sum% = = 0); Return $valid; } return false; }

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