PHP and intVal

I need some help to add few audio effects to website.

I found some examples like following,

audioOn: true

audio.muted = false

setAudioOn true    

 ref: "audio",
    attrs: {
      "id": "projects-audio" ...

I have a table called volume_issue that looks like this:

 +----+-------------------------------------------------------+-----------------+-----------+---------------------+
| id | url                                                   | journal_title   | issn      | volume_issue        |
+----+-------------------------------------------------------+-----------------+-----------+---------------------+
|  1 | https://www.ajol.info/index.php/asan/issue/view/17048 | Africa Sanguine ...

Hey everyone,

I'm at a stand still at this bit of code. Ultimately, I want to "expand"/slide down a class to show the rest of the hidden content (the list ...