Validating credit card number length
Here is the corrected version: you can get the German format 1.234,56.(Comma as decimal separator and point as thousand separator) But I have a problem with that: I want to add commas as thousand separators and change the decimal-separator (this could also be done with str_replace), but I do not want to change the amount of fractional digits!This gives merchants a way to verify the validity of a card number prior to accepting the customer's payment.The calculation to compare a credit card number against its check sum is known as the Luhn algorithm.
Credit Card / Debit Card Number Checker tool is designed to check the validity of Credit Card / Debit Card Number and check the (BIN) base on updated database.But I want that 1234.56 changes into 1.234,.567890123456 changes into 1.234,567890123456 So, I created following function, that doesn't change the amount of fractional digits: I'd like to comment to the old notes of "stm555" and "woodynadobhar".They wrote about "number_format_unlimited_precision()". I guess many of us need that kind of function, which is the almost same function as number_format but don't round a number. (I fixed somethings like bugs of the function in the old comment.)output is: string(10) "1.234,5678" PHP Warning: 2 parameters for number_format_unchanged_precision() have the same value, that is "," for $dec_point and $thousands_sep in...In my function my_number_format() [shown below] there was a bug.If a negative number which is smaller than 1 was entered (-0,...), then the result was wrongly positive because 0 is equal to -0 (the content of $tmp which was interpretet as numeric value).
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