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PHP Filter Quiz: All Filter Functions [2019]

The filter_has_var PHP filter function, sized for tablet viewing.

This post provides a reference table and subsequent quiz for all seven PHP filter functions, from filter_has_var() to filter_var(). The reference table and subsequent quiz can be sized appropriately for mobile, tablet, and desktop viewing. There is even the option to have the computer complete the quiz itself, thanks to the magic of JavaScript!

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