距离排序 php

以下是一个使用 PHP 实现的距离排序的示例代码：

function distance($point1, $point2) {
    $x1 = $point1['x'];
    $y1 = $point1['y'];
    $x2 = $point2['x'];
    $y2 = $point2['y'];

    return sqrt(pow($x2 - $x1, 2) + pow($y2 - $y1, 2));
}

$points = [
    ['x' => 1, 'y' => 2],
    ['x' => 3, 'y' => 4],
    ['x' => 5, 'y' => 6],
    ['x' => 7, 'y' => 8],
    ['x' => 9, 'y' => 10]
];

usort($points, function($point1, $point2) {
    $distance1 = distance($point1, ['x' => 0, 'y' => 0]);
    $distance2 = distance($point2, ['x' => 0, 'y' => 0]);

    if ($distance1 == $distance2) {
        return 0;
    }

    return ($distance1 < $distance2) ? -1 : 1;
});

foreach ($points as $point) {
    echo 'x: ' . $point['x'] . ', y: ' . $point['y'] . "\n";
}

该代码首先定义了一个 distance 函数，用于计算两个点之间的距离。然后，定义了一个包含多个点的数组 $points。使用 usort 函数对这些点进行排序，排序的依据是每个点到原点的距离。最后，通过循环输出排序后的点的坐标。