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<?php $array = array( array( "type" => "a", "value" => 1 ), array( "type" => "a", "value" => 2 ), array( "type" => "a", "value" => 3 ), array( "type" => "b", "value" => 1 ), array( "type" => "b", "value" => 1 ),array( "type" => "b", "value" => 4 ), array( "type" => "f", "value" => 2 ) ); foreach ($array as $element) $newArray[$element["type"]][] = $element["value"]; var_dump($newArray);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 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 - 8.3.6
array(3) { ["a"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } ["b"]=> array(3) { [0]=> int(1) [1]=> int(1) [2]=> int(4) } ["f"]=> array(1) { [0]=> int(2) } }

preferences:
256.92 ms | 406 KiB | 313 Q