将字符串转换为等效的多维数组

Question

我正在尝试从 URL 解析字符串并将其转换为 PHP 数组，但到目前为止我还无法让它正常工作。 该字符串包含逗号分隔的值，然后按句点分组，例如：

course.id,course.title,course.author,course.duration,course.trailer.video_key,course.trailer.duration,course.lessons.id,course.lessons.title,track.id,track.title,track.caption.srt,track.caption.vtt,track.caption.text

等价于这个字符串的数组是：

PHP：

$array = [
    'course' => [
        'id',
        'title',
        'author',
        'duration',
        'trailer' => [
            'video_key',
            'duration'
        ],
        'lessons' => [
            'id',
            'title'
        ]
    ],
    'track' => [
        'id',
        'title',
        'caption' => [
            'srt',
            'vtt',
            'text'
        ]
    ]
];

我目前的解决方案是这样的：

PHP：

$string = 'course.id,course.title,course.author,course.duration,course.trailer.video_key,course.trailer.duration,course.lessons.id,course.lessons.title,track.id,track.title,track.caption.srt,track.caption.vtt,track.caption.text';
$parameters = explode( ',', $string );

$array = array();
$inset = array();

foreach ( $parameters as $parameter ) {

    $segments = explode( '.', $parameter );

    if ( ! array_key_exists( $segments[0], $inset ) ) {
        $array[ $segments[0] ] = array();
        $inset[ $segments[0] ] = true;
    }

    $array[ $segments[0] ] = array_merge( $array[ $segments[0] ], addSegment( $segments, 1 ) );

}

function addSegment( $segments, $counter ) {

    $results = array();

    if ( end( $segments ) == $segments[ $counter ] ) {
        return array( $segments[ $counter ] => null );
    }

    $results[ $segments[ $counter ] ] = addSegment( $segments, $counter + 1 );

    return $results;

}

不过，这有点奏效；它失败了，像这样更简单的字符串 course,track,lessons

我认为这需要递归，但我不擅长写这个，所以我希望有人已经这样做并且可以帮助我。

谢谢。

Answer 1

您无需递归即可实现此目的 - 只需双循环并使用 &:

$arr = explode(",", "course.id,course.title,course.author,course.duration,course.trailer.video_key,course.trailer.duration,course.lessons.id,course.lessons.title,track.id,track.title,track.caption.srt,track.caption.vtt,track.caption.text");
foreach($arr as $e) {
    $e = explode(".", $e);
    $obj = &$res; //set the current place root
    while(count($e) > 1) { // last element will be add as value
        $key = array_shift($e);
        if (!isset($obj[$key]))
            $obj[$key] = [];
        $obj = &$obj[$key]; //reset the current place
    }
    $obj[] = array_shift($e); // add the last as value to current place
}

$res 将包含你想要的输出