Online PHP editor | output for ROTMP

@ 2018-09-09T16:57:14Z

<?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 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: <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>
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 <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>

preferences:dark modelive preview