计算数组数组中的匹配项 PHP

Question

Array
(
    [0] => Array
    (
        [song] => More Than A Feeling
        [artist] => Not Boston
        [time] => 15:00
    )

    [1] => Array
    (
        [song] => More Than A Feeling
        [artist] => Boston
        [time] => 11:20
    )
    [2] => Array
    (
        [song] => More Than A Feeling
        [artist] => Boston
        [time] => 15:23
    )
)

有一个像这样的数组数组。我正在尝试计算所有匹配项。现在我正在使用

array_count_values(array_column($arr, 'song'));

这很好，但如果艺术家不匹配，它也会算作歌曲。我正在尝试输出以下内容。

Array
    (
    [0] => Array
    (
        [song] => More Than A Feeling
        [artist] => Not Boston
        [count] => 1
    )

    [1] => Array
    (
        [song] => More Than A Feeling
        [artist] => Boston
        [count] => 2
    )
)

不确定从哪里开始。感谢您的帮助！

Answer 1

在一个简单的循环中手动完成。我将搜索 $songs 数组并将元素添加到 $songCounters 中，不重复。输出 $songCounters 数组将包含歌曲和计数，其顺序是计数作为歌曲的下一个元素。

[(song)(count)(song)(count)]

代码如下：

//Here is your input array
$songs = array(0 => array('song' => 'More Than A Feeling', 'artist' => 'Not Boston', 'time' => 0), 
               1 => array('song' => 'More Than A Feeling', 'artist' => 'Boston', 'time' => 0), 
               2 => array('song' => 'More Than A Feeling', 'artist' => 'Boston', 'time' => 0));


$songCounters = array();    //Initialize the output array


//Now lets go through the input array
foreach($songs as $song) {

    //Prepare the current song
    $currentSong = array('song' => $song['song'], 'artist' => $song['artist']);


    //Get the index of the current song from $songCounters
    $index = array_search($currentSong, $songCounters);

    //Insert if not found
    if ($index == false) {
        array_push($songCounters, $currentSong);
        array_push($songCounters, 1);       //Next element is the counter
    }       
    else {
        $songCounters[$index + 1]++;    //Increase the counter if found
    } 

}    

print_r($songCounters);

这里是phpfiddle.

Answer 2

找到了另一个问题的答案。这对我有用。

$arr = array(0 => array('song' => 'More Than A Feeling', 'artist' => 'Not Boston', 'time' => 0), 
           1 => array('song' => 'More Than A Feeling', 'artist' => 'Boston', 'time' => 0), 
           2 => array('song' => 'More Than A Feeling', 'artist' => 'Boston', 'time' => 0));


$hash = array();
$array_out = array();

foreach($arr as $item) {
    $hash_key = $item['song'].'|'.$item['artist'];
    if(!array_key_exists($hash_key, $hash)) {
        $hash[$hash_key] = sizeof($array_out);
        array_push($array_out, array(
            'song' => $item['song'],
            'artist' => $item['artist'],
            'count' => 0,
    ));
}
$array_out[$hash[$hash_key]]['count'] += 1;

}

 var_dump($array_out);

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