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PHP function to verify whether the credit card number is correct, PHP to verify the credit card number_PHP tutorial
- WBOYOriginal
- 2016-07-13 09:52:25961browse
PHP function to verify whether a credit card number is correct, php to verify a credit card number
You can use the following PHP function to verify whether a card number is a credit card:
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 % 2 == $parity ) $digit = $digit * 2 ;
if ( $digit > 9 ) $digit = $digit - 9 ;
$sum = $sum + $digit ;
}
$valid = ( $sum % 10 == 0 ) ;
return $valid ;
}
return false ;
}
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