求高手指点，foreach遍历三维数组时只能遍历出第一个子级，这是为什么呢？

												<tbody>												<?php $count=0 ;$countParent=0 ; if(isset($monitorList)){ foreach($monitorList as $key=>$val){													?>													<tr class="treegrid-<?=$key+1+$count?>" style="cursor: pointer;">														<td><?=$val['id']?></td>														<td title=<?=$val['name']?> onclick="task(<?=$val['id']?>,'<?=$val['name']?>')"><?=Util::msubstr($val['name'],0,16,'gbk')?></td>														<td><?if(!empty($val[$key])){echo count($val[$key]);}else{echo $val['product_qty'];}?></td>														<td><?=date("Y-m-d ",strtotime($val['date_start']))?></td>														<td><?=$val['plan_director_name']?></td>																																<td style="padding: 0px;">																<span><?switch($val['status']){case 1: echo '10%';break;case 9: echo '100%';default: echo ((intval($val['status'])-1)*20).'%';}?></span>																<div id="progressouter" style=" border:2px solid red; height:10px; width: 64px;display:block"><div id="progressinner" style="position: relative; width:<?switch($val['status']){case 1: echo '10';break;case 9: echo '100';default: echo ((intval($val['status'])-1)*20);}?>%; height:6px; background:#23bd00;"></div></div>														</td>														<td>															<a style="cursor: pointer;" onclick="window.location.href='/opt_monitoring/show.candor?plan_type=<?=$val['plan_type']?>&workcenter_id=<?=$val['workcenter_id']?>&plan_id=<?=$val['id']?>'" id="show">															查看</a>  														</td>													</tr>										<?php 															$countParent=$key+1+$count;$child=0;														if(is_array($val[$key]))foreach($val[$key] as $v){    //这里只执行了一次															if($val['id']==$v['parent_id']){															$count=$count+1;$child=$child+1;										?>													<tr class="treegrid-<?echo $countParent+$child?> treegrid-parent-<?=$countParent?>">														<td><?=$v['id']?></td>														<td><?=Util::msubstr($val['name'],0,16,'gbk')?></td>														<td><?=1?></td>														<td><?=date("Y-m-d ",strtotime($v['date_start']))?></td>														<td><?=$val['plan_director_name']?></td>														<td style="padding: 0px;">																<span><?if($v['status']=='1'){echo '10%';}else if($v['status']=='9'){echo '100%';}else{ echo ((intval($v['status'])-1)*20).'%';}?></span>																<div id="progressouter" style=" border:2px solid red; height:10px; width: 64px;display:block"> <div id="progressinner" style="position: relative; width:<?if($v['status']=='1'){echo '10';}else if($v['status']=='9'){echo '100';}else{ echo ((intval($v['status'])-1)*20);}?>%; height:6px; background:#23bd00;"></div></div>														</td>														<td><?=$v['status']?></td>													</tr>												<?}												}												}}?>												</tbody>

回复讨论(解决方案)

三维数组需要三个foreach嵌套遍历才可以。

但是我第一个父节点下的子节点能遍历出来啊

不是特别清楚你的数据结构，检查一下这个条件有没有满足
if(is_array($val[$key]))

你的外层循环是
foreach($monitorList as $key=>$val)
进入内层循环的条件是
if(is_array($val[$key]))
不符合条件时，自然就没有输出

你至少应
var_export($monitorList);
贴出结果看看

0 =>   array (    'id' => '6166',    'create_uid' => '1000',    'create_date' => '2015-01-30 09:48:10.000',    'write_uid' => '1000',    'write_date' => '2015-01-30 09:48:10.000',    'name' => 'C#高级编程',    'plan_type' => '102',    'parent_id' => '0',    'date_start' => '2015-01-30 00:00:00.000',    'date_stop' => '2015-01-30 00:00:00.000',    'product_id' => '2',    'product_qty' => '1',    'plan_director' => '',    'status' => '2',    'routing_id' => '2049',    'bom_id' => '1',    'oe_production_id' => '0',    'note' => '',    'curr_id' => NULL,    'oe_ean13' => '9002',    'workcenter_id' => NULL,    'ischild' => 1,    'plan_director_name' => '',    0 =>     array (      0 =>       array (        'id' => '6167',        'create_uid' => '1000',        'create_date' => '2015-01-30 09:48:11.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 09:48:11.000',        'name' => 'C#高级编程_xyd工艺组1',        'plan_type' => '102',        'parent_id' => '6166',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '2',        'product_qty' => NULL,        'plan_director' => '',        'status' => '1',        'routing_id' => '1',        'bom_id' => NULL,        'oe_production_id' => NULL,        'note' => 'oo',        'curr_id' => NULL,        'oe_ean13' => NULL,        'workcenter_id' => NULL,      ),      1 =>       array (        'id' => '6168',        'create_uid' => '1000',        'create_date' => '2015-01-30 09:49:20.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 09:49:20.000',        'name' => 'C#高级编程_xyd工艺组2',        'plan_type' => '102',        'parent_id' => '6166',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '2',        'product_qty' => NULL,        'plan_director' => '',        'status' => '1',        'routing_id' => '2',        'bom_id' => NULL,        'oe_production_id' => NULL,        'note' => 'pp',        'curr_id' => NULL,        'oe_ean13' => NULL,        'workcenter_id' => NULL,      ),    ),  ),  1 =>   array (    'id' => '6189',    'create_uid' => '1000',    'create_date' => '2015-01-30 14:45:00.000',    'write_uid' => '1000',    'write_date' => '2015-01-30 14:45:00.000',    'name' => 'Java高级编程',    'plan_type' => '102',    'parent_id' => '0',    'date_start' => '2015-01-30 00:00:00.000',    'date_stop' => '2015-01-30 00:00:00.000',    'product_id' => '6',    'product_qty' => '1',    'plan_director' => '',    'status' => '1',    'routing_id' => '2045',    'bom_id' => '6',    'oe_production_id' => '0',    'note' => '',    'curr_id' => NULL,    'oe_ean13' => '9002',    'workcenter_id' => NULL,    'ischild' => 1,    'plan_director_name' => '',    0 =>     array (      0 =>       array (        'id' => '6190',        'create_uid' => '1000',        'create_date' => '2015-01-30 14:45:00.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 14:45:00.000',        'name' => 'Java高级编程_Java高级编程-次包-工序包1',        'plan_type' => '102',        'parent_id' => '6189',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '6',        'product_qty' => NULL,        'plan_director' => '',        'status' => '4',        'routing_id' => '8',        'bom_id' => NULL,        'oe_production_id' => NULL,        'note' => '',        'curr_id' => '3032',        'oe_ean13' => NULL,        'workcenter_id' => NULL,      ),    ),  ),  2 =>   array (    'id' => '6191',    'create_uid' => '1000',    'create_date' => '2015-01-30 14:48:38.000',    'write_uid' => '1000',    'write_date' => '2015-01-30 14:48:38.000',    'name' => 'Java高级编程',    'plan_type' => '102',    'parent_id' => '0',    'date_start' => '2015-01-30 00:00:00.000',    'date_stop' => '2015-01-30 00:00:00.000',    'product_id' => '6',    'product_qty' => '1',    'plan_director' => '',    'status' => '1',    'routing_id' => '2045',    'bom_id' => '6',    'oe_production_id' => '0',    'note' => '',    'curr_id' => NULL,    'oe_ean13' => '9002',    'workcenter_id' => NULL,    'ischild' => 1,    'plan_director_name' => '',    0 =>     array (      0 =>       array (        'id' => '6192',        'create_uid' => '1000',        'create_date' => '2015-01-30 14:48:38.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 14:48:38.000',        'name' => 'Java高级编程_Java高级编程-主包-工序包1',        'plan_type' => '102',        'parent_id' => '6191',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '6',        'product_qty' => NULL,        'plan_director' => '',        'status' => '8',        'routing_id' => '7',        'bom_id' => NULL,        'oe_production_id' => NULL,        'note' => '',        'curr_id' => NULL,        'oe_ean13' => NULL,        'workcenter_id' => NULL,      ),    ),  ),  3 =>   array (    'id' => '6193',    'create_uid' => '1000',    'create_date' => '2015-01-30 14:51:45.000',    'write_uid' => '1000',    'write_date' => '2015-01-30 14:51:45.000',    'name' => 'C#高级编程',    'plan_type' => '102',    'parent_id' => '0',    'date_start' => '2015-01-30 00:00:00.000',    'date_stop' => '2015-01-30 00:00:00.000',    'product_id' => '2',    'product_qty' => '1',    'plan_director' => '',    'status' => '1',    'routing_id' => '2043',    'bom_id' => '1',    'oe_production_id' => '0',    'note' => '',    'curr_id' => NULL,    'oe_ean13' => '9002',    'workcenter_id' => NULL,    'ischild' => 1,    'plan_director_name' => '',    0 =>     array (      0 =>       array (        'id' => '6194',        'create_uid' => '1000',        'create_date' => '2015-01-30 14:51:45.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 14:51:45.000',        'name' => 'C#高级编程_C#高级编程-主包',        'plan_type' => '102',        'parent_id' => '6193',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '2',        'product_qty' => NULL,        'plan_director' => '',        'status' => '2',        'routing_id' => '5',        'bom_id' => NULL,        'oe_production_id' => NULL,        'note' => '',        'curr_id' => NULL,        'oe_ean13' => NULL,        'workcenter_id' => NULL,      ),    ),  ),  4 =>   array (    'id' => '6195',    'create_uid' => '1000',    'create_date' => '2015-01-30 15:12:48.000',    'write_uid' => '1000',    'write_date' => '2015-01-30 15:12:48.000',    'name' => 'C#高级编程',    'plan_type' => '102',    'parent_id' => '0',    'date_start' => '2015-01-30 00:00:00.000',    'date_stop' => '2015-01-30 00:00:00.000',    'product_id' => '2',    'product_qty' => '1',    'plan_director' => '',    'status' => '1',    'routing_id' => '2043',    'bom_id' => '1',    'oe_production_id' => '0',    'note' => 'ld',    'curr_id' => NULL,    'oe_ean13' => '9002',    'workcenter_id' => NULL,    'ischild' => 1,    'plan_director_name' => '',    0 =>     array (      0 =>       array (        'id' => '6196',        'create_uid' => '1000',        'create_date' => '2015-01-30 15:12:48.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 15:12:48.000',        'name' => 'C#高级编程_主包',        'plan_type' => '102',        'parent_id' => '6195',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '2',        'product_qty' => NULL,        'plan_director' => '',        'status' => '5',        'routing_id' => '5',        'bom_id' => NULL,        'oe_production_id' => NULL,        'note' => 'ld',        'curr_id' => '2008',        'oe_ean13' => NULL,        'workcenter_id' => NULL,      ),    ),  ),  5 =>   array (    'id' => '6197',    'create_uid' => '1000',    'create_date' => '2015-01-30 15:38:50.000',    'write_uid' => '1000',    'write_date' => '2015-01-30 15:38:50.000',    'name' => 'C#高级编程',    'plan_type' => '102',    'parent_id' => '0',    'date_start' => '2015-01-30 00:00:00.000',    'date_stop' => '2015-01-30 00:00:00.000',    'product_id' => '2',    'product_qty' => '1',    'plan_director' => '',    'status' => '1',    'routing_id' => '2043',    'bom_id' => '1',    'oe_production_id' => '0',    'note' => '',    'curr_id' => NULL,    'oe_ean13' => '9002',    'workcenter_id' => NULL,    'ischild' => 1,    'plan_director_name' => '',    0 =>     array (      0 =>       array (        'id' => '6198',        'create_uid' => '1000',        'create_date' => '2015-01-30 15:38:50.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 15:38:50.000',        'name' => 'C#高级编程_次包1',        'plan_type' => '102',        'parent_id' => '6197',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '2',        'product_qty' => NULL,        'plan_director' => '',        'status' => '3',        'routing_id' => '6',        'bom_id' => NULL,        'oe_production_id' => NULL,        'note' => '',        'curr_id' => NULL,        'oe_ean13' => NULL,        'workcenter_id' => NULL,      ),      1 =>       array (        'id' => '6199',        'create_uid' => '1000',        'create_date' => '2015-01-30 15:38:50.000',        'write_uid' => '1000',        'write_date' => '2015-01-30 15:38:50.000',        'name' => 'C#高级编程_主包',        'plan_type' => '102',        'parent_id' => '6197',        'date_start' => '2015-01-30 00:00:00.000',        'date_stop' => '2015-01-30 00:00:00.000',        'product_id' => '2',//富文本框限制字符串为10000所以删了些      ),    ),  ),)

看到这结果就昏了

if (is_array($val)) { //判断$val的值是否是一个数组，如果是，则进入下层遍历

??是
if (is_array($val)) 判?是否有下一?

谢谢各位大侠的指点错误原因找到了，后台压数据时没指定下标，直接$monitorList[$key][]=query($sql);导致前台遍历出错。
给个下标就搞定了。