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run code in 150+ php & hhvm versions
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<?php $array = array( 55 => array( 'ident' => 'test 1', 'depth' => 1, ), 77 => array( 'parent_id' => 55, 'ident' => 'test 2', 'depth' => 2, ), 109 => array( 'parent_id' => 77, 'ident' => 'test 3', 'depth' => 3, ), 78 => array( 'parent_id' => 55, 'ident' => 'test 4', 'depth' => 2, ), 25 => array( 'ident' => 'test 5', 'depth' => 1, ) ); function v1($array) { 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]); } return $array; } function &find_by_key($key, $array) { if(array_key_exists($key, $array)) { return &$array[$key]; } else { foreach($array as $sub) { if(isset($sub['children']) && NULL !== ($found = find_by_key($key, $sub['children']))) { return $found; } } } return NULL; } function v2($array) { $out = array(); foreach ($array as $key => $sub) { if(!isset($sub['parent_id'])) { $out[$key] = $sub; } else { $parent = find_by_key($sub['parent_id'], $out); $parent['children'][$key] = $sub; } } return $out; } //var_dump(v1($array)); var_dump(v2($array));
Output for 5.3.0 - 5.4.20
Parse error: syntax error, unexpected '&' in /in/GZ5dc on line 48
Process exited with code 255.