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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 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
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) } }