mysql 引用php中变量查询

 mysql 引用php中变量查询时，要加{}，比如 $start_time = '2019-01-01 13:50:42'; $end_time = '2019-04-06 00:00:00'; echo var_dump('2019-06-09 00:00:00'); //string datetime $sql="SELECT * FROM test where timeall >

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