How to hide tags in php

How to implement hidden tags in php: first open the corresponding PHP sample file; then make a mark flag in php and pass it over; finally add "

>" is enough.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

Specific questions:

About the problem of hiding the div tag in PHP

<div id="tes">test</div>
<input type="submit" onclick="a();" value="test" />
<?php
function a(){
echo "<script type=&#39;text/javascript&#39;> document.getElementById(&#39;tes&#39;).style.display=&#39;none&#39;; </script>";
}
?>

What's wrong? If this function needs to be modified, how should it be modified?

Solution:

1. Because the hiding of the div tag itself is controlled by css style, that is,

So the question will change to controlling the display in style

2. Answer the question in Part 1, make a mark flag in php and pass it over, and then in the html page

>

When the flag is set to true, it is hidden. When false, it will be displayed.

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