計算數組中值的百分比

Question

我有以下數組$browser ：

Array
(
    [2] => Array
        (
            [0] => Internet Explorer
            [1] => 5809
        )

    [3] => Array
        (
            [0] => Chrome
            [1] => 9205
        )

    [4] => Array
        (
            [0] => Safari
            [1] => 5288
        )

    [5] => Array
        (
            [0] => Opera
            [1] => 102
        )

有沒有辦法計算每個元素的百分比。 我試過這個funtcion：

foreach ($browser as $key => $value){
print_array(array_avg($browser[$key][1]) );
    }

function array_avg($array, $round=1){
$num = count($array);
return array_map(
    function($val) use ($num,$round){
        return array('count'=>$val,'avg'=>round($val/$num*100, $round));
    },
    array_count_values($array));
}

我的代碼中有錯誤嗎？ 謝謝！

Answer 1

嘗試這樣的事情：

// calculate the sum; first transform the array in something with only integers, then sum that array
$sum = array_sum(array_map(function ($a) { return $a[1]; }, $browser));

// walk through the array, print the percentage (value / sum) for each browser
foreach ($browser as $info) {
    echo 'Percentage for browser '.$info[0].' = '.round(($info[1]/$sum)*100).'%<br>';
}