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多维数组判断,该怎么解决

WBOY
Release： 2016-06-13 12:26:36
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多维数组判断
city[x] [y] 
x储存省的id
y储存x省的城市的id
如果city[x]下没有数据  
说明省是空的 可以删除
反之不能           怎么解？
------解决思路----------------------

foreach($city as $key->$item) {<br />  if(count($itrm) <== 0) unset($city[$key]);<br />}<br />
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Related labels：
count foreach key nbsp
source：php.cn
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