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,

< /div> 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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