What are some common compatibility issues with embedding audio files in PHP websites?

One common compatibility issue when embedding audio files in PHP websites is that certain browsers may not support the audio file format being used. To solve this, you can use the HTML5 <audio> tag with multiple source elements to provide alternative audio formats that different browsers can play.

&lt;audio controls&gt;
  &lt;source src=&quot;audio.mp3&quot; type=&quot;audio/mpeg&quot;&gt;
  &lt;source src=&quot;audio.ogg&quot; type=&quot;audio/ogg&quot;&gt;
  Your browser does not support the audio element.
&lt;/audio&gt;