php - Get all combinations of array -

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i need combinations of array.

example:

array                 (                     array("a","b"),                                    array("1","2","3","4")                                 );

and need 

array                 (                     array("a","1"),                                    array("a","2"),                                    array("a","3"),                                    array("a","4"),                                    array("b","1"),                                    array("b","2"),                                    array("b","3"),                                    array("b","4"),                                );

of course must work when sizeof($array) >= 2.

thanks much


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