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Using a variable in "category_and"

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Last Modified: 2014-05-02
If I use...

query_posts( array( 'category__and' => array( 10,55,56 )));

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...I get the expected results.

However I need to use a variable instead:

$catarray = 'array( 10,55,56 )' 
query_posts( array( 'category__and' => $catarray));

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When I do that,I don't get any results.

My category IDs (which will populate $catarray) come in from a form and I want only the post that fit ALL of the categories.

Can anyone please help?!
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