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<?php $arrRes = array( array("2018-08-01"=>"X" , "2018-08-02"=>"O" , "2018-08-03"=>"O" , "2018-08-04"=>"O"), array("2018-08-01"=>"X" , "2018-08-02"=>"X" , "2018-08-03"=>"O" , "2018-08-04"=>"O"), array("2018-08-01"=>"X" , "2018-08-02"=>"X" , "2018-08-03"=>"O" , "2018-08-04"=>"X"), array("2018-08-01"=>"X" , "2018-08-02"=>"O" , "2018-08-03"=>"O" , "2018-08-04"=>"O"), ); $arraySum = ['rows' => ['X'=>[0,0,0,0],'O'=>[0,0,0,0]],'cols' => ['X'=>[0,0,0,0],'O'=>[0,0,0,0]]]; foreach($arrRes as $keyRow => $row){ foreach($row as $keyCol => $col){ $arraySum['rows'][$col][$keyRow]++; $arraySum['cols'][$col][array_search($keyCol,array_keys($row))]++; } } echo "<pre>".print_r($arraySum,1)."</pre>";
Output for 5.6.38, 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.23, 7.4.0 - 7.4.11, 8.0.0alpha1 - rc2
<pre>Array ( [rows] => Array ( [X] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 1 ) [O] => Array ( [0] => 3 [1] => 2 [2] => 1 [3] => 3 ) ) [cols] => Array ( [X] => Array ( [0] => 4 [1] => 2 [2] => 0 [3] => 1 ) [O] => Array ( [0] => 0 [1] => 2 [2] => 4 [3] => 3 ) ) ) </pre>