如何从API/URL的特定数组中获取指定stream_title的content_stream

你的代码核心问题在于：找到匹配content_id的频道后，错误地使用了频道循环的索引$i去获取streams->live数组中的流，这导致无论传入的stream_title是什么，都会取到对应索引的流（比如content_id=1时$i=0，固定取SD流）。

修复后的代码 #

// The result of the request:
$json = <<<END_OF_STRING
{"live":  [{"content_id": "1","title": "Channel 1","country_id": "2","language_id": "6","genre_id": "1","image_url": "","epg": {"daily": "","weekly": ""},"streams": {"live": [{"stream_title": "SD","content_stream": "http://example.com/sd/1","default": "0"}, {"stream_title": "HD","content_stream": "http://example.com/hd/1","default": "1"}, {"stream_title": "FHD","content_stream": "http://example.com/fhd/1","default": "0"}],"dvr": ""}}, {"content_id": "2","title": "Channel 2","country_id": "2","language_id": "6","genre_id": "2","image_url": "","epg": {"daily": "","weekly": ""},"streams": {"live": [{"stream_title": "SD","content_stream": "http://example.com/sd/2","default": "0"}, {"stream_title": "HD","content_stream": "http://example.com/hd/2","default": "1"}, {"stream_title": "FHD","content_stream": "http://example.com/fhd/2","default": "0"}],"dvr": ""}}]}
END_OF_STRING;

$json_decoded = json_decode($json);

$content_id = $_GET['content_id'];
$stream_title = $_GET['stream_title'];
$desiredLink = '';

// 遍历所有频道
foreach ($json_decoded->live as $channel) {
    // 匹配目标content_id
    if ($channel->content_id === $content_id) {
        // 遍历当前频道的所有直播流
        foreach ($channel->streams->live as $stream) {
            // 匹配指定的stream_title
            if ($stream->stream_title === $stream_title) {
                $desiredLink = $stream->content_stream;
                break; // 找到后退出循环，提升效率
            }
        }
        break; // 找到目标频道后退出外层循环
    }
}

// 可选：如果未找到指定清晰度，返回默认流（比如HD）
if (empty($desiredLink)) {
    foreach ($json_decoded->live as $channel) {
        if ($channel->content_id === $content_id) {
            foreach ($channel->streams->live as $stream) {
                if ($stream->default === "1") {
                    $desiredLink = $stream->content_stream;
                    break;
                }
            }
            break;
        }
    }
}

echo $desiredLink;

关键修改点 #

• 改用foreach遍历频道和流，逻辑更清晰，避免索引混乱
• 找到匹配content_id的频道后，单独遍历该频道下的所有live流，对比stream_title参数获取对应流地址
• 增加了默认流 fallback 逻辑：如果传入的stream_title不存在（比如拼写错误），会自动返回标记为default:1的流（即HD）

现在测试链接https://example.com/ch.php?content_id=1&stream_title=HD，会正确返回http://example.com/hd/1；传入stream_title=FHD则返回http://example.com/fhd/1，完全符合需求。

内容的提问来源于stack exchange，提问作者achraf