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Monday, August 25. 2008

Data Filtering Using PHP's Filter Functions - Part one

Filtering data. We all have to do it. Most, if not all of us, despise doing it. However, unbeknown to most are PHP's filter_* functions, that allow us to do all sorts of filtering and validation. 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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