Detect screen size in php

Detecting the screen size in php, is not something that can be done with php alone but the following is what I use to kind of get around it.

Firstly, we need to have a css page and have it included, such as;

<meta name="viewport" content="width=device-width, initial-scale=1.0">  

<link rel="stylesheet" href="resources/common.css">

In our common.css file, we can have something like;

@media screen and (max-width: 600px) {

    .hide_in_mobile_view{
        display: none;
        visibility: hidden;
        /*display: block;*/
        /*visibility: visible;*/
    }
}

In the above, anything below a screen width of 600 will be affected. 

We can add the class to whatever we want such as;

<div class="hide_in_mobile_view">
...
</div>

In the case of php, we can do the following;

<div class="hide_in_mobile_view">
    <?php
        echo "normal view";
    ?>
</div>

normal view will only be displayed on screen widths greater than 600.