![]() A checksum defined as a small datum which allows to detect errors of data or validate data integrity. The most important step in Validate Credit Card Number Using PHP is the checksum validation. Amex credit card numbers has 15 numbers and they start with 34 or 37.Visa cards have 4 as their prefix while the the length is 13 or 16.Number length is always considered as 16. Marstercard numbers always start with 51,52, 53, 54 or 55.These patterns are vary for each card type. In the credit card number pattern validation process, the main concern is crosscheck the given number against the pattern of available credit card types.
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