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php - check if $_POST is array?

I know this may be a silly question, but I come across a snippet of php code that check if the $_POST is_array() before execute other functions.

Now I guess that $_POST should be always an associative array or not? is this check really needed? and why?

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If it hasn't been changed in some manner like

$_POST = 'not array';

then it is array ;-)


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