What is the best way to validate a credit card in PHP?
42413
How do you detect Credit card type based on number?
5179
Validate PHP form field if not left empty
157148
What are the valid characters in PHP variable, method, class, etc names?
18132
How to store credit card info on iphone?
157573
To what extend should I rely on client-side validation?
129036
How do I silence PHP errors?
26873
Is it possible to validate a Public Key in RSA?
4541
ZIP Code (US Postal Code) validation
3141
JavaScript: client-side vs. server-side validation
79296
How to validate an email address in PHP
89978
How to check if PHP array is associative or sequential?
89873
PHP: a short cut for isset and !empty?
43104
How should the "and/or" text of a card be interpreted?
115343
Regular expression credit card search using Exchange Web Services?
95039
How to validate a form for following scenario?
151778
In PHP, how do I generate a big pseudo-random number?
18709
How should I validate an e-mail address?