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<?php $array = [ 'a' => ['id' => 20, 'name' => 'chimpanzee'], 'b' => ['id' => 40, 'name' => 'meeting'], 'c' => ['id' => 20, 'name' => 'dynasty'], 'd' => ['id' => 50, 'name' => 'chocolate'], 'e' => ['id' => 10, 'name' => 'bananas'], 'f' => ['id' => 50, 'name' => 'fantasy'], 'g' => ['id' => 50, 'name' => 'football'] ]; asort($array); $result = []; array_walk( $array, function($row, $k) use (&$result) { $result[$row['id']][$k] = $row; } ); var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 10 => array ( 'e' => array ( 'id' => 10, 'name' => 'bananas', ), ), 20 => array ( 'a' => array ( 'id' => 20, 'name' => 'chimpanzee', ), 'c' => array ( 'id' => 20, 'name' => 'dynasty', ), ), 40 => array ( 'b' => array ( 'id' => 40, 'name' => 'meeting', ), ), 50 => array ( 'd' => array ( 'id' => 50, 'name' => 'chocolate', ), 'f' => array ( 'id' => 50, 'name' => 'fantasy', ), 'g' => array ( 'id' => 50, 'name' => 'football', ), ), )

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