This code allows to get the IP address from which the user is viewing the current page.
This checks if the referrer is from the site you expect it to be.
Latest source code will always be here: http://code.google.com/p/isemail/source/browse/trunk
Great if you want to make sure an email ends in a certain extension.
A function that does a simple JPEG image validation
Is it a valid IP?
A simple email validator.
Checks if a string is alphanumeric.
Validates the length of a string
A function that validates e-mail addresses with dns lookup and syntax check
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