Question

我有一个MySQL，PHP代码如下。

$sql = "SELECT * FROM shipschedule WHERE ship_date BETWEEN '2016-08-01' AND '2016-8-31'";
$result = $mysqli->query($sql);
$e = array();

while($r = $result->fetch_array()) {
    $rows = array();
    $rows['title'] = $r['title'];
    $rows['start'] = $r['ship_date'];
    array_push($e, $rows);
}
echo json_encode($e);

上面的php代码回声

[{"title":"111","start":"2016-08-10"},
 {"title":"111","start":"2016-08-10"},
 {"title":"111","start":"2016-08-10"},
 {"title":"222","start":"2016-08-17"},
 {"title":"222","start":"2016-08-17"},
 {"title":"222","start":"2016-08-16"}]

我的问题是我如何回应上面的内容，而不是如下。请注意，重复的开始日期将按标题删除。

[{"title":"111","start":"2016-08-10"},
 {"title":"222","start":"2016-08-17"},
 {"title":"222","start":"2016-08-16"}]

标题111具有相同的3个开始日期，我需要将其显示为

{"title":"111","start":"2016-08-10"},

标题222具有相同的2个开始日期，我需要将其显示为

 {"title":"222","start":"2016-08-17"},
 {"title":"222","start":"2016-08-16"}]

Answer 1

您可以阻止接收重复项，并通过调整查询来减少请求不必要的数据。

SELECT DISTINCT title, start FROM ...

Answer 2

从MySQL获取正确（唯一）数据会更容易（也可能更快）。这可以通过distinct修饰符来实现：

SELECT DISTINCT title, start
FROM   shipschedule
WHERE  ship_date BETWEEN '2016-08-01' AND '2016-8-31'

如何从PHP中删除json中的重复项

2 个答案: