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<?php $arr = Array ( 0 => Array ( 0 => 'Red', 1 => 'Steel' ), 1 => Array ( 0 => 'Red', 1 => 'Wood' ) , 2 => Array ( 0 => 'Blue', 1 => 'Wood' ) ); $colors = array_count_values(array_column($arr, 0)); $materials = array_count_values(array_column($arr, 1)); print_r($colors); print_r($materials);
Output for git.master_jit, rfc.property-hooks, git.master
Array ( [Red] => 2 [Blue] => 1 ) Array ( [Steel] => 1 [Wood] => 2 )

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