在关联数组中查找范围

Question

我正在尝试从关联数组中找到一个范围。数据来自 Racelogic（汽车性能 GPS 盒），所以我特别想从数组中提取 0-100。

可在此处找到完整数组：link

看起来像这样 (sats,time,lat,long,velocity,heading,height,vert-vel,yaw-calc,slip,YAW__,YAW_,):

Array
(
[31] => Array
    (
        [0] => 006
        [1] => 194300,70
        [2] => +03560,94626
        [3] => -01079,53898
        [4] => 009,490
        [5] => 000,00
        [6] => +00048,59
        [7] => -000,432
        [8] => +000,0
        [9] => +0,00000E+00
        [10] => +0,00000E+00
        [11] => +0,00000E+00
        [12] => 
    )

[32] => Array
    (
        [0] => 005
        [1] => 194300,80
        [2] => +03560,94660
        [3] => -01079,53760
        [4] => 008,630
        [5] => 259,90
        [6] => +00050,46
        [7] => -000,180
        [8] => +000,0
        [9] => +0,00000E+00
        [10] => +0,00000E+00
        [11] => +0,00000E+00
        [12] => 
    )
)

等等。在这种情况下，“4”是速度。数据可以包含许多 0-100 运行，我想提取它们。我如何保存数据并不重要，可以是数组或字符串。速度值永远不会准确地达到“100,000”，所以当它超过时需要，但是范围应该始终从“000,000”开始。

我在 PHP 方面相当不错，但是这个 logic/algorithm 让我头晕目眩了一段时间。非常感谢任何帮助或建议。

编辑：抱歉有点不明确，你自己的头脑总是更清楚。数组包含速度数据，我想提取加速度运行s，特别是 0-100。目前数据中有几个0-100 运行。这意味着我不仅想要最小值和最大值，我还想要每个运行的 0-100 之间的所有数据。我的最终目标是保存范围并使用 D3.js 播放它们，并在不同的汽车之间进行比较。

Answer 1

一种非常繁重的方法是按速度对整个数据集进行排序：

$data_sorted = usort($data, function($a, $b) {
    return $a[4] < $b[4];
});

另一种方法是先使用 array_column 将速度提取到自己的数组中：

$velocities = array_column($data, 4);

然后使用 min() 和 max()，或 sort() 来获取最小值和最大值。

第三次尝试是只使用一个循环和 2 个运行变量。

$max = 0.0; $min = 100.0;
foreach ($data as $set) {
    $max = max($max, $set[4]);
    $min = min($min, $set[4]);
}

Answer 2

澄清之后，我重新阅读了你的问题并写了一些应该找到数据中所有"runs"的东西。

演示：http://codepad.viper-7.com/NSNJ0L

<?php
$data = array(
    array('001', '194300,70', '+03560,94626', '-01079,53898', '109,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('002', '194300,70', '+03560,94626', '-01079,53898', '209,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('003', '194300,70', '+03560,94626', '-01079,53898', '009,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('004', '194300,70', '+03560,94626', '-01079,53898', '039,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('005', '194300,70', '+03560,94626', '-01079,53898', '069,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('006', '194300,70', '+03560,94626', '-01079,53898', '099,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('007', '194300,70', '+03560,94626', '-01079,53898', '109,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('008', '194300,80', '+03560,94660', '-01079,53760', '128,630', '259,90', '+00050,46', '-000,180', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('009', '194300,70', '+03560,94626', '-01079,53898', '001,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('010', '194300,70', '+03560,94626', '-01079,53898', '051,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('011', '194300,70', '+03560,94626', '-01079,53898', '101,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
    array('012', '194300,70', '+03560,94626', '-01079,53898', '019,490', '000,00', '+00048,59', '-000,432', '+000,0', '+0,00000E+00', '+0,00000E+00', '+0,00000E+00', '', ),
);

    $targetColumn = 4;
    $minValue = 0;
    $maxValue = 100;

    $found = false;
    $filtered = array();
    $run = 0;

    foreach($data as $row){
        //get our target value
        $val = $row[$targetColumn];

        //parse it as a number
        $val = floatval(str_replace(',', '.', $val));

        //if not found yet and our value is between the min and max, mark as found
        if(!$found && ($val >= $minValue && $val <= $maxValue)){
            $found = true;
        }

        //if found, add this value to the filtered array
        if($found){
            $filtered[$run][] = $row;

            //if our value is over the max, increment our run and reset found
            if($val > $maxValue){
                $run++;
                $found = false;
            }
        }
    }

    echo '<pre>'.print_r($filtered, true);

在关联数组中查找范围

Find a range in associative arrays

php

arrays

range