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变量无法赋值是咋回事

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Release： 2016-06-13 12:43:05
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变量无法赋值是怎么回事？
$Starttime=$_get["starttime"];
$Endtime=$_get["endtime"];
$Time_temp="and createdate>='$Starttime' and createdate
$starttime,$endtime都有值，请问
echo $time_temp输入为：
and createdate>='' and createdate 是怎么回事？ 

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