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run code in 150+ php & hhvm versions
Bugs & Features
<?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($array);
Output for 5.0.0 - 7.1.0
array(2) { [55]=> array(2) { ["ident"]=> string(6) "test 1" ["children"]=> array(2) { [77]=> array(3) { ["parent_id"]=> int(55) ["ident"]=> string(6) "test 2" ["children"]=> array(1) { [109]=> array(2) { ["parent_id"]=> int(77) ["ident"]=> string(6) "test 3" } } } [78]=> array(2) { ["parent_id"]=> int(55) ["ident"]=> string(6) "test 4" } } } [25]=> array(1) { ["ident"]=> string(6) "test 5" } }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/QfVUr on line 26
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/QfVUr on line 26
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/QfVUr on line 26
Process exited with code 255.