#! code

When validating a password it is easy enough to make sure that the password is of a certain length, but what happens if you want to make sure that the password has at least one number, or contains a mixture of upper and lowercase letters? I recently had to validate a password like this and so I created a password validation class that allows easy validation of a password string to a set of given parameters, but also allow these parameters to be changed when needed.

If you want to incorporate a W3C validation check into an application then you can use the following class. It uses file_get_contents() to get the contents of the file and then uses regular expressions to return either the number of errors or -1 is any errors occur. Of course if the document is valid the function will return 0.

EAN13 barcodes are commonly used to label products in Europe. If you want to know more about how they work then please view the Wikipedia entry on European Article Numbers.

EAN13 barcodes are actually 12 digits long and are validated by using a check digit, which is placed at the end, making the code 13 digits long. The check digit is worked out by the following process: