截取多个JSON的参数值遇到有关问题

截取多个JSON的参数值遇到问题。
POST获取的JSON数据  [{"Name":"PM","Value":"224"},{"Name":"WD","Value":"25"},{"Name":"SD","Value":"34"},]

如何截取 Name＝WD 的Value？
求代码。
------解决方案--------------------

$json = '[{"Name":"PM","Value":"224"},{"Name":"WD","Value":"25"},{"Name":"SD","Value":"34"}]';<br />$jsonArr = json_decode($json) ;<br />foreach ($jsonArr as  $value) {<br />	if($value->Name == 'WD'){<br />		echo $value->Value."<br />";<br />	}<br />}<br /><br />