3v4l.org

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<?php $array = [ 'visitPoints'=>[ 20=>[2,5,6,8,10,11], 35=>[2,5,6] ], 'islands'=>[ 20=>[5,10,11], 35=>[5,6] ], 'animals'=>[ 20=>[5,11] ,35=>[] ] ]; $result = [ 20=>[5,11], 35=>[] ]; print_r($array);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Array ( [visitPoints] => Array ( [20] => Array ( [0] => 2 [1] => 5 [2] => 6 [3] => 8 [4] => 10 [5] => 11 ) [35] => Array ( [0] => 2 [1] => 5 [2] => 6 ) ) [islands] => Array ( [20] => Array ( [0] => 5 [1] => 10 [2] => 11 ) [35] => Array ( [0] => 5 [1] => 6 ) ) [animals] => Array ( [20] => Array ( [0] => 5 [1] => 11 ) [35] => Array ( ) ) )
preferences:
91.48 ms | 404 KiB | 62 Q