<?phpheader("Content-type:text/html;charset=UTF-8");$mixTree=array();/**每个结果中的重点数据两个一个是id一个是指向其父结点id的parent*/$mixTree[]=array('id'=>0,'val'=>'顶级菜单1','parent'=>-1);$mixTree[]=array('id'=>1,'val'=>'顶级菜单2','parent'=>-1);$mixTree[]=array('id'=>2,'val'=>'顶级菜单1下的二级菜单1','parent'=>0);$mixTree[]=array('id'=>3,'val'=>'顶级菜单1下的二级菜单2','parent'=>0);$mixTree[]=array('id'=>4,'val'=>'顶级菜单2下的二级菜单1','parent'=>1);$mixTree[]=array('id'=>5,'val'=>'顶级菜单1下的二级菜单2下的三级菜单1','parent'=>3);/**通过二维数组把上面的数据挂载成树*/$treeDatas=array();foreach($mixTreeas$nodeDatas){if($nodeDatas['parent']==-1){$treeDatas[-1][]=$nodeDatas;}else{$treeDatas[$nodeDatas['parent']][]=$nodeDatas;}}/**遍历打印其父结点及其子结点*/functiontraverSesing($nodeDatas,$treeDatas){echo$nodeDatas['val'];if(!empty($treeDatas[$nodeDatas['id']])&&is_array($treeDatas[$nodeDatas['id']])){echo'<ul>';foreach($treeDatas[$nodeDatas['id']]as$childNodeDatas){echo'<li>';traverSesing($childNodeDatas,$treeDatas);echo'</li>';}echo'</ul>';}}echo'<ul>';foreach($treeDatas[-1]as$nodeDatas){echo'<li>';traverSesing($nodeDatas,$treeDatas);echo'</li>';}echo'</ul>';

执行结果如图：