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    <p><strong>PHP Code</strong></p> <pre><code>function validateCC($cc_num, $type) { if($type == "American") { $denum = "American Express"; } elseif($type == "Dinners") { $denum = "Diner's Club"; } elseif($type == "Discover") { $denum = "Discover"; } elseif($type == "Master") { $denum = "Master Card"; } elseif($type == "Visa") { $denum = "Visa"; } if($type == "American") { $pattern = "/^([34|37]{2})([0-9]{13})$/";//American Express if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Dinners") { $pattern = "/^([30|36|38]{2})([0-9]{12})$/";//Diner's Club if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Discover") { $pattern = "/^([6011]{4})([0-9]{12})$/";//Discover Card if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Master") { $pattern = "/^([51|52|53|54|55]{2})([0-9]{14})$/";//Mastercard if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Visa") { $pattern = "/^([4]{1})([0-9]{12,15})$/";//Visa if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } if($verified == false) { //Do something here in case the validation fails echo "Credit card invalid. Please make sure that you entered a valid &lt;em&gt;" . $denum . "&lt;/em&gt; credit card "; } else { //if it will pass...do something echo "Your &lt;em&gt;" . $denum . "&lt;/em&gt; credit card is valid"; } } </code></pre> <p>Usage</p> <pre><code>echo validateCC("1738292928284637", "Dinners"); </code></pre> <p><strong>More theoric information can be found here:</strong></p> <p><a href="http://www.beachnet.com/~hstiles/cardtype.html" rel="nofollow noreferrer">Credit Card Validation - Check Digits</a></p> <p><a href="http://en.wikipedia.org/wiki/Luhn_algorithm" rel="nofollow noreferrer">Checksum</a></p>
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    1. POWhat is the best way to validate a credit card in PHP?
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    1. USPatrick Desjardins
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    1. COThat algorithm may identify the card issuer, roughly, it doesn't validate whether the number makes sense.. e.g. it doesn't check the checksum using the Luhn algorithm!
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      1. USRay Hayes
    2. COWhy is it "Dinners"?
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