How to generate a tree without recursion in PHP

Today I will bring you an article on how to implement PHP without recursive spanning tree. Share it with everyone and give it as a reference. I hope to be helpful.

PHP tree-implementation method that does not require recursion

/** * 创建父节点树形数组 * 参数 * $ar 数组，邻接列表方式组织的数据 * $id 数组中作为主键的下标或关联键名 * $pid 数组中作为父键的下标或关联键名 * 返回 多维数组 **/ function find_parent($ar, $id='id', $pid='pid') { foreach($ar as $v) $t[$v[$id]] = $v; foreach ($t as $k => $item){ if( $item[$pid] ){ if( ! isset($t[$item[$pid]]['parent'][$item[$pid]]) ) $t[$item[$id]]['parent'][$item[$pid]] =& $t[$item[$pid]]; } } return $t; } /** * 创建子节点树形数组 * 参数 * $ar 数组，邻接列表方式组织的数据 * $id 数组中作为主键的下标或关联键名 * $pid 数组中作为父键的下标或关联键名 * 返回 多维数组 **/ function find_child($ar, $id='id', $pid='pid') { foreach($ar as $v) $t[$v[$id]] = $v; foreach ($t as $k => $item){ if( $item[$pid] ) { $t[$item[$pid]]['child'][$item[$id]] =& $t[$k]; } } return $t; } $data = array( array('ID'=>1, 'PARENT'=>0, 'NAME'=>'祖父'), array('ID'=>2, 'PARENT'=>1, 'NAME'=>'父亲'), array('ID'=>3, 'PARENT'=>1, 'NAME'=>'叔伯'), array('ID'=>4, 'PARENT'=>2, 'NAME'=>'自己'), array('ID'=>5, 'PARENT'=>4, 'NAME'=>'儿子'), ); $p = find_parent($data, 'ID', 'PARENT'); $c = find_child($data, 'ID', 'PARENT'); Print_r ($c);

Execution effect:

Array ( [1] => Array ( [ID] => 1 [PARENT] => 0 [NAME] => 祖父 [child] => Array ( [2] => Array ( [ID] => 2 [PARENT] => 1 [NAME] => 父亲 [child] => Array ( [4] => Array ( [ID] => 4 [PARENT] => 2 [NAME] => 自己 [child] => Array ( [5] => Array ( [ID] => 5 [PARENT] => 4 [NAME] => 儿子 ) ) ) ) ) [3] => Array ( [ID] => 3 [PARENT] => 1 [NAME] => 叔伯 ) ) ) [2] => Array ( [ID] => 2 [PARENT] => 1 [NAME] => 父亲 [child] => Array ( [4] => Array ( [ID] => 4 [PARENT] => 2 [NAME] => 自己 [child] => Array ( [5] => Array ( [ID] => 5 [PARENT] => 4 [NAME] => 儿子 ) ) ) ) ) [3] => Array ( [ID] => 3 [PARENT] => 1 [NAME] => 叔伯 ) [4] => Array ( [ID] => 4 [PARENT] => 2 [NAME] => 自己 [child] => Array ( [5] => Array ( [ID] => 5 [PARENT] => 4 [NAME] => 儿子 ) ) ) [5] => Array ( [ID] => 5 [PARENT] => 4 [NAME] => 儿子 ) )

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