codeigniter - how i find field name photo - 


    array     (         [photo] => array             (                 [name] => john_doe.jpg                 [type] => image/jpeg                 [tmp_name] => c:\xampp\tmp\php9a1e.tmp                 [error] => 0                 [size] => 39052             )     )

i $_files multidimensional array want 1st field name of array in php how find field name photo


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