Is it possible to define a class based on a php variable

Question

I want to define the body as a certain colour based upon a variable.

I have been trying things to this affect.

<?php

    $seperate_sitting_yes = "Yes";


    if($seperate_sitting_yes == "Yes")

{
?>

    <style type="text/css"></style>
        body {
        background-color: blue;
        }
    </style>

<?
}
?>

Is there a way to do this. I figured as you could use HTML in this way, maybe you could define styles like this...

Any thoughts...Thanks.

Answer 1

In your unedited question you had a </style> too much, just remove the </style> tag and it works!!

<?php
        $seperate_sitting_yes = "Yes";
        if($seperate_sitting_yes == "Yes")
    {
    ?>
        <style type="text/css">
            body {
            background-color: blue;
            }
        </style>
 <?php
   }
 ?>

Answer 2

This is one way to do it

<?php $seperate_sitting_yes = 'Yes'; ?>
<style type="text/css">
    body {
        background-color: <?= $seperate_sitting_yes == "Yes" ? "blue" : ""; ?>;
    }
</style>

or

<?php $seperate_sitting_yes = 'Yes'; ?>
<?php if($seperate_sitting_yes == "Yes") : ?>
<style type="text/css">
    body {
        background-color: "blue";
    }
</style>
<?php endif ?>

or

<?php $seperate_sitting_yes = 'Yes';
    if($seperate_sitting_yes == 'Yes'){
     echo '<style type="text/css"> body {background-color: "blue";}</style>';
    }
?>