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<?php $array = array( 55 => array( 'ident' => 'test 1', ), 77 => array( 'parent_id' => 55, 'ident' => 'test 2', ), 109 => array( 'parent_id' => 77, 'ident' => 'test 3', ), 78 => array( 'parent_id' => 55, 'ident' => 'test 4', ), 25 => array( 'ident' => 'test 5', ) ); foreach ($array as $key => &$sub) { if (isset($sub['parent_id'])) { $array[$sub['parent_id']]['children'][$key] = &$sub; } } unset($sub); // unset the reference to make sure to not overwrite it later... // now remove the entries with parents foreach ($array as $key => $sub) { if (isset($sub['parent_id'])) unset($array[$key]); } var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [55]=> array(2) { ["ident"]=> string(6) "test 1" ["children"]=> array(2) { [77]=> array(3) { ["parent_id"]=> int(55) ["ident"]=> string(6) "test 2" ["children"]=> array(1) { [109]=> array(2) { ["parent_id"]=> int(77) ["ident"]=> string(6) "test 3" } } } [78]=> array(2) { ["parent_id"]=> int(55) ["ident"]=> string(6) "test 4" } } } [25]=> array(1) { ["ident"]=> string(6) "test 5" } }

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