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	<title>algorithm Archives - Richard Warrender</title>
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		<title>Validating Credit Card Numbers</title>
		<link>https://richardwarrender.com/2006/12/validating-card-numbers/</link>
					<comments>https://richardwarrender.com/2006/12/validating-card-numbers/#respond</comments>
		
		<dc:creator><![CDATA[Richard Warrender]]></dc:creator>
		<pubDate>Sat, 16 Dec 2006 22:11:59 +0000</pubDate>
				<category><![CDATA[PHP]]></category>
		<category><![CDATA[Programming]]></category>
		<category><![CDATA[Web]]></category>
		<category><![CDATA[algorithm]]></category>
		<category><![CDATA[e-commerce]]></category>
		<category><![CDATA[php]]></category>
		<category><![CDATA[validation]]></category>
		<guid isPermaLink="false">http://richardwarrender.com/?p=160</guid>

					<description><![CDATA[Lately, I’ve been working on an e–commerce website and discovered a handy algorithm for validating card numbers. The Luhn algorithm (also known as mod 10) is a checksum formula and is used to protect against accidental errors rather than malicious attacks. The algorithm is particularly useful for checking to see if the card number ‘looks’ [&#8230;]]]></description>
		
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