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    global $empire;
    $query = "select * from table where date='2017-04-20'" ;
    $sql=$empire->query($query);
    while($row=$empire->fetch($sql){
        //code
        echo $row['date']
    }

global $empire;
    $query = "select * from table where group by date" ;
    $sql=$empire->query($query);
    while($row=$empire->fetch($sql){
        //code
        echo $row['date']
    }

//這樣就能獲得所有日期且不重復(fù)了

This is very easy. Your date is a field in the data inventory? Is the value Y-m-d or Y-m-d H:i:s? No matter what it is, just query it based on time? Difficulties?

It’s very simple, but it needs to be done in combination with the front end. When you select 2017-04-20, you send a request to your php through ajax. The data sent is 2017-04-20, and your php processing page only You need to receive the time, then splice the sql, query, and then return the results to the front end.