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By aphpguy
via devolio.com
Published: Aug 27 2008 / 04:00

Data filtering using PHP's filter functions
Using PHP's filter_* functions, we can validate and sanitize data types, URLs, e-mail addresses, IP addresses, strip bad characters, and more, all with relative ease. This is part one of two, covering filter_var() and the different constants and flags that can be set.
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