按降序对数组值进行排序

Question

如何按降序对值进行排序？我试过 arsort();但在我的情况下它不起作用：

$text1 = 'Android SDK, application, familiar with MVP architecture, android studio, angular, angular js';

$skill = array("android sdk"=>"3", "application"=>"1", "angular"=>"2", "android studio"=>"3", "angular js"=>"3");

foreach ($skill as $skills => $weight)            {

if (preg_match_all("~\b$skills\b~i", $text1, $matchWords)) {  

$matchWords = $matchWords[0];

$matchWords = array_unique($matchWords);

}  

$text2 = 'Native Android development';

// Filter $words, keep only the items that are not present in $text2
$missing = array_filter(
    $matchWords,
    function($w) use ($text2) {
        // return TRUE when $w is not in $text
        return preg_match('/\b'.preg_quote($w, '/').'\b/i', $text2) == 0;
});


$weight = array($weight);
$dev = array_combine($missing, $weight);
arsort($dev);

foreach($dev as $x => $x_value) 
     echo "Key: " . $x . " Value: " . $x_value;
     echo "<br>";

}

输出：

键：Android SDK 值：3 关键：应用价值：1 键：角度值：2 键：android studio 值：3 键：angular js 值：3

但我想得到这个结果：

键：Android SDK 值：3 键：android studio 值：3 键：角度 js 值：3 键：角度值：2 键：应用值：1

编辑：

我没有按照建议找到答案here。

Answer 1

您的数组未正确排序的原因是您试图对单个元素数组进行排序。如果您在代码中添加调试打印，您将看到$dev 在您调用arsort 时只有一个元素。您需要在循环中组装$dev，然后对其进行排序。试试这样的：

$text1 = 'Android SDK, application, familiar with MVP architecture, android studio, angular, angular js';
$text2 = 'Native Android development';
$skill = array("android sdk"=>"3", "application"=>"1", "angular"=>"2", "android studio"=>"3", "angular js"=>"3");

foreach ($skill as $skills => $weight) {
    if (preg_match_all("~\b$skills\b~i", $text1, $matchWords)) {  
        $matchWords = $matchWords[0];
        $matchWords = array_unique($matchWords);
    }  
    // Filter $words, keep only the items that are not present in $text2
    $missing = array_filter(
        $matchWords,
        function($w) use ($text2) {
            // return TRUE when $w is not in $text
            return preg_match('/\b'.preg_quote($w, '/').'\b/i', $text2) == 0;
    });

    if (count($missing)) $dev[$missing[0]] = $weight;
}
arsort($dev);

foreach($dev as $x => $x_value) {
    echo "Key: " . $x . " Value: " . $x_value;
    echo "<br>";
}

输出：

Key: Android SDK Value: 3
Key: android studio Value: 3
Key: angular js Value: 3
Key: angular Value: 2
Key: application Value: 1

您的循环代码可以大大简化，但这是另一个问题...

Answer 2

使用ksort

替换：

arsort($dev);

有

ksort($dev);

它会按键对数组进行排序

如果需要反转，使用array_reverse:

ksort($dev);
$dev = array_reverse($dev);

Answer 3

自定义排序函数

uasort( $dev, function ( $a, $b ) {
    if ( intval( $a ) === intval( $b ) ) {
        return 0;
    }
    return intval( $a ) > intval( $b ) ? -1 : +1;
} );