filter_has_var vs isset

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i using following sanitize input prior validating:

 

if(filter_has_var(input_post, "$var")) {

$sanitized = filter_input(input_post, '$var', filter_sanitize_string);

$_post['$var'] = trim($sanitized);

 

is preferable use filter_has_var() check input or isset()? there difference , it?

 

thank in advance help.

according anonymous note in php documentation, filter_has_var() faster isset(). i've no idea if that's accurate, hasn't been removed php documentation team, seems legitimate.

 

other that, there's no difference.



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