Question

将一个变量添加到mysql查询的末尾。现在我需要能够按相关值排序。有人可以帮忙吗？我尝试了几种不同的排序方法。

$result2 = mysqli_query($datacon,
    "SELECT * FROM spreadsheet 
        WHERE brand = '$brand' 
            AND package = '$package' 
            AND HIDE_FROM_SEARCH = '0' 
        GROUP BY ACCTNAME $pages->limit");

echo mysqli_error($datacon);
while($row = mysqli_fetch_array($result2)) {
    $lat_B=$row['LATITUDE'];
    $long_B=$row['LONGITUDE'];

    $lat_A = round($lat_A,2);
    $long_A = round($long_A,2);
    $lat_B = round($lat_B,2);
    $long_B = round($long_B,2);
    $distance = new calcDist($lat_A, $long_A, $lat_B, $long_B);
    $distance = $distance->calcDist($lat_A, $long_A, $lat_B, $long_B);
    $distance = round($distance,2);
    $locationSort=array($row);
    $locationSort['distance']=$distance;

    FOR EACH SOMETHING?
}

我修改了之前的帖子，以反映我对答案的使用。

$result2 = mysqli_query($datacon,"SELECT * FROM spreadsheet WHERE brand = '$brand'
                AND package = '$package' and HIDE_FROM_SEARCH = '0' GROUP BY ACCTNAME $pages->limit");

                echo(mysqli_error($datacon));
                class sortBydistance
                {
                    function sortBydistance($a, $b) {
                        if ($a['distance'] == $b['distance']) {
                            return 0;
                        }
                        return ($a['distance'] < $b['distance']) ? -1 : 1;
                    }
                }
                while($row = mysqli_fetch_array($result2))
                {
                        $lat_B=$row['LATITUDE'];
                        $long_B=$row['LONGITUDE'];

                    $lat_A = round($lat_A,2);
                    $long_A = round($long_A,2);
                    $lat_B = round($lat_B,2);
                    $long_B = round($long_B,2);
                    $distance = new calcDist($lat_A, $long_A, $lat_B, $long_B);
                    $distance = $distance->calcDist($lat_A, $long_A, $lat_B, $long_B);
                    $distance = round($distance,2);


                }
                $locationSort=array($row);
                $locationSort['distance']=$distance;
                uasort($locationSort, array($this, "sortBydistance"));
                print_r($locationSort);

Answer 1

可能你没有正确检索$ bran和$ package变量..

$result2 = mysqli_query($datacon,
    "SELECT * FROM spreadsheet 
        WHERE brand = '".$brand."' 
            AND package = '".$package."' 
            AND HIDE_FROM_SEARCH = '0' 
        GROUP BY ACCTNAME ".$pages->limit.");

Answer 2

首先，创建条目数组，并将其存储在数组中，我们将调用$rows。

您希望在此处使用PHP函数usort来提供自定义排序回调。

假设您有一个如下所示的数组：

$rows = array(
    array("latitude" => 5, "distance" => 10),
    array("latitude" => 10, "distance" => 5),
    array("latitude" => 56, "distance" => 48)
);

您希望对此$rows数组进行重新排序，以便latitude == 10的条目为第一个，latitude == 5为第二个，latitude == 56为第三个，具体取决于它们的距离

usort($rows, function ($a, $b) {
    $a = $a['distance'];
    $b = $b['distance'];

    return $a == $b ? 0 : $a > $b ? 1 : -1;
});

输出

Array
(
    [0] => Array
        (
            [latitude] => 10
            [distance] => 5
        )

    [1] => Array
        (
            [latitude] => 5
            [distance] => 10
        )

    [2] => Array
        (
            [latitude] => 56
            [distance] => 48
        )

)

See this demonstration at ideone.com

或者，您可以尝试查找SortedArray实现，该实现将使元素在插入到数组时保持排序，而不是仅在您在数组上调用usort()时。不过，对于这个问题来说，这有点太先进了。

Answer 3

在while循环后尝试此操作：

uasort($locationSort, 'sortBydistance');
// or uasort($locationSort, array($this, "sortBydistance")); if you are using withing a class
print_r($locationSort);

function sortBydistance($a, $b) {
    if ($a['distance'] == $b['distance']) {
        return 0;
    }
    return ($a['distance'] < $b['distance']) ? -1 : 1;
}

通过添加的变量对数组进行排序

3 个答案: