Question

在输出时，我想要一个每个唯一高度的行的数组。如果输入中存在具有相同ext和height（如0,6）的行，则只需获取第一个值。如果有height的{{1}}优先于jpg而非png优先于gif的行（3,9,10）。

这是输入数组：

到目前为止，这是我丑陋的代码：

foreach ($input as $row) {
    if (!empty($row['height'])) {
        $vo['height'] = $row['height'];
        $vo['md5'] = $row['md5'];
        $vo['ext'] = $row['ext'];
        $help_array[$row['height']][$row['ext']][] = $vo; // creates help array grouped by height
    }
}
$i = 0;
foreach ($help_array as $helps) {
    foreach ($helps as $k => $help) {
        if ($k == 'jpg') { // best format to use
            $output[$i] = $help[0];
            break;
        }
    }
    if (empty($output[$i])) { // if still empty use png
        foreach ($helps as $k => $help) {
            if ($k == 'png') {
                $output[$i] = $help[0];
                break;
            }
        }
    }
    if (empty($output[$i])) { // if there is no jpg or png take gif
        foreach ($helps as $k => $help) {
            if ($k == 'gif') {
                $output[$i] = $help[0];
                break;
            } else { // or take what left
                $output[$i] = $help[0];
                break;
            }
        }
    }
    ++$i;
}
print_r($output);

它有太多行:-)这应该是输出数组（可选择没有ext列，因为它不再需要）按height排序：

[output] => Array
    (
        [0] => Array
            (
                [ext] => jpg
                [height] => 150
                [md5] => cce4f98878b0c302cb3de0dcd27d8bc8
            )


        [1] => Array
            (
                [ext] => jpg
                [height] => 330
                [md5] => 8d167a1952ds1df64a3b1a423c95b32b
            )

        [2] => Array
            (
                [ext] => gif
                [height] => 400
                [md5] => kke4f98878b0c302cb3de0dcd27d8bc8
            )

        [3] => Array
            (
                [ext] => png
                [height] => 430
                [md5] => gce4f98878b0c302cb3de0dcd27d8bc8
            )

        [4] => Array
            (
                [ext] => bmp
                [height] => 500
                [md5] => 89e4f98878b0c302cb3de0dcd27d8bc8
            )

        [5] => Array
            (
                [ext] => jpg
                [height] => 800
                [md5] => 87167a1952911df64a3b1a423c95b32b
            )

        [6] => Array
            (
                [ext] => jpg
                [height] => 1024
                [md5] => 912ec803b2ce49e4a541068d495ab570
            )

Answer 1

这是一个可以解决问题的简单功能

function filterAndSort($input){
    $output = array();
    $extensionsWeght = array(
        'jpg' => 0,
        'png' => 1,
        'gif' => 2
    );
    foreach ($input as $v) {
        //Edit 1:  skip if no hieght is present
        if(!isset($v['height'])){
            continue;
        }
        if (!isset($output[$v['height']])) {
            //If it's a new height, add it
            $output[$v['height']] = $v;
        } else {
            //else, choose the prefered ext [if they have the same ext, the first entry is already choosen]
            if ($extensionsWeght[$output[$v['height']]['ext']] > $extensionsWeght[$v['ext']]) {
                $output[$v['height']] = $v;
            }
        }
    }
    //Sort the ouput by height key
    // usort($output, function($a, $b) {
    //    return $a['height'] - $b['height'];
    //});

    //Edit 2 :

    //For sorting the array, as it is indexed with the height key,
    // you can use the built in functions to sort it. (ksort for this case)
    ksort($output);

    return array_values($output);
}

您可以找到测试here

php - 根据首选的行值组简化从多维数组中选择

1 个答案: