PHP 无限级分类、排序（）

PHP 无限级分类、排序（）

 lyk625358

<?phpheader('content-type:text/html;charset=utf-8');echo "<pre>";//-无限级排序,自己优化改良的,清除上次调用此函数后留下的静态变量的值$arr = array(    array('id'=>2,'cname'=>'分类2','parent_id'=>1),    array('id'=>9,'cname'=>'分类9','parent_id'=>8),    array('id'=>1,'cname'=>'分类1','parent_id'=>0),    array('id'=>7,'cname'=>'分类7','parent_id'=>0),    array('id'=>3,'cname'=>'分类3','parent_id'=>2),    array('id'=>4,'cname'=>'分类4','parent_id'=>0),    array('id'=>6,'cname'=>'分类6','parent_id'=>5),    array('id'=>8,'cname'=>'分类8','parent_id'=>7),    array('id'=>5,'cname'=>'分类5','parent_id'=>4));// 根据子类id 找所有父类function _getParent($data, $son_id, $level=0, $isClear=true){    //声明一个静态数组存储结果    static $res = array();    //刚进入函数要清除上次调用此函数后留下的静态变量的值，进入深一层循环时则不要清除    if($isClear==true) $res =array();    foreach ($data as $v) {        if($v['id'] == $son_id){            $v['level'] = $level;            $res[] = $v;            _getParent($data, $v['parent_id'], $level-1, $isClear=false);        }    }    return $res;}print_r(_getParent($arr, 6));echo "<hr color='red'>";// 根据父类id找所有子类function _getSon($data, $p_id=0, $level=0, $isClear=true){    //声明一个静态数组存储结果    static $res = array();    //刚进入函数要清除上次调用此函数后留下的静态变量的值，进入深一层循环时则不要清除    if($isClear==true) $res =array();    foreach ($data as $v) {        if($v['parent_id'] == $p_id){            $v['level'] = $level;            $res[] = $v;            _getSon($data, $v['id'], $level+1, $isClear=false);        }    }    return $res;}print_r(_getSon($arr, 0));echo "<hr color='red'>";