FIEO: Filtering Input with PHP’s Filter Functions
Brand-new PHP developers have drilled into their heads the concept of Filter Input, Escape Output (FIEO). This concept essentially insists that all user-provided content be filtered or escaped, without exception. With the delivery of PHP 5.2.0, this got a lot easier, because PHP included, by default, the Filter library.
Before the Filter library, doing something such as validating an email address often required an ugly regular expression along the lines of this:
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Brandon Savage has been a software developer since 2003. Ever since discovering that he could use software to automate routine tasks, he's been hooked. Brandon is passionate about perfecting the art of software development.