php无限级分类示例代码

<?php
/**
 * 无限级分类 类
 */
class Category{
 /**
 * 返回一维数组
 * @param [type] $cate 要递归的数组
 * @param string $html 子级分类前要显示的缩进符号。默认 '─'
 * @param integer $pid 父级分类ID。默认为 0，表示顶级分类
 * @param integer $level level级，配合 $html 显示足够的缩进。默认为 1，表示顶级分类
 * @return [type] [description]
 */
 static public function unlimitedForLevel($cate, $html = '─', $pid = 0, $level = 1){
 $arr = array();
 foreach($cate as $v){
 if($v['pid'] == $pid){
 $v['level'] = $level;
 $v['html'] = str_repeat($html, $level - 1);
 $arr[] = $v;
 $arr = array_merge($arr, $this->unlimitedForLevel($cate, $html, $v['id'], $level + 1));
 }
 }
 return $arr;
 }
 /**
 * 返回多维数组
 * @param [type] $cate 要递归的数组
 * @param string $name 子级分类在父分类数组中的 key
 * @param integer $pid 父级分类ID。默认为0，表示顶级分类
 * @return [type] [description]
 */
 static public function unlimitedForlayer($cate, $name = 'child', $pid = 0){
 $arr = array();
 foreach($cate as $v){
 if( $v['pid'] == $pid){
 $v[$name] = self::unlimitedForlayer($cate, $name, $v['id']);
 $arr[] = $v;
 }
 }
 return $arr;
 }
 /**
 * 传递子分类ID返回所有父级分类
 * @param [type] $cate 要递归的数组
 * @param [type] $id 子分类ID
 * @return [type] [description]
 */
 static public function getParents($cate, $id){
 $arr = array();
 foreach($cate as $v){
 if($v['id'] == $id){
 $arr[] = $v;
 $arr = array_merge(self::getParents($cate, $v['pid']), $arr);
 }
 }
 return $arr;
 }
 /**
 * 传递父级分类ID返回所有子分类ID
 * @param [type] $cate 要递归的数组
 * @param [type] $pid 父级分类ID
 * @return [type] [description]
 */
 static public function getChildrenId($cate, $pid){
 $arr = array();
 foreach($cate as $v){
 if($v['pid'] == $pid){
 $arr[] = $v['id'];
 $arr = array_merge($arr, self::getChildrenId($cate, $v['id']));
 }
 }
 return $arr;
 }
 /**
 * 传递父级分类ID返回所有子级分类
 * @param [type] $cate 要递归的数组
 * @param [type] $pid 父级分类ID
 * @return [type] [description]
 */
 static public function getChildren($cate, $pid){
 $arr = array();
 foreach($cate as $v){
 if($v['pid'] == $pid){
 $arr[] = $v;
 $arr = array_merge($arr, self::getChildren($cate, $v['id']));
 }
 }
 return $arr;
 }
}
?>