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我可以从互联网将音频文件下载到 sd 卡中，但下载的音频文件未显示在设备的默认媒体播放器中。我应该怎么做才能让它也被列在默认媒体播放器中
这是我的php代码：
<?php /* some code */ function blah() { /* some code */ if (!$book || !$txt) { ?> <h1>Page Error</h1> <p>Th