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<?php $partylist = ['party1','party2','party3']; $position = ['position1','position2','position3']; $members= ['name1','name2','name3','name4','name5','name6','name7','name8','name9']; $partymembers = array_chunk($members,count($position)); $partyArray=[]; foreach($partylist as $key1 => $party){ $partyArray[$party] = []; foreach($position as $key2 => $p){ $partyArray[$party][$p] = isset($partymembers[$key1][$key2]) ? $partymembers[$key1][$key2] : ''; } } echo "<pre>".print_r($partyArray,1)."</pre>";
Output for 5.6.38, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
<pre>Array ( [party1] => Array ( [position1] => name1 [position2] => name2 [position3] => name3 ) [party2] => Array ( [position1] => name4 [position2] => name5 [position3] => name6 ) [party3] => Array ( [position1] => name7 [position2] => name8 [position3] => name9 ) ) </pre>

preferences:
146.79 ms | 409 KiB | 5 Q