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From: Jim Lucas on 30 Sep 2010 14:58
Brian Smither wrote:
>> Personally, I would change that to be
>> if ( function_exists('filter_var') ) {
>
> So would I:
> *But it's not my code.
> *I wish to learn and understand the cause of the problem - not walk around it.
>
>> It means condition (PHP_VERSION >= 5.2.0)
>
> I understand that. There was a second, more relevant, part to my question.
>
> I have found the version of PHP used as reported in the HTTP header responses.
>
> filter_var() is undefined in PHP/5.2.4_p20070914-pl2-gentoo
>

As Paul pointed out, maybe your version of PHP was built without the filter_var
function compiled in.
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