How to modify CSS dynamically using PHP

As I said in the comment, when loading a style sheet even with HTACCESS, the parameters do not pass, at most pass via GET an ULR such as: <link ... href="localhost/php.css?parametro=XXX">

In order not to have such clear data exposure and to improve the parameter, I will use base64_encode and base64_decode in the $_GET variable in the style sheet file, along with parse_str to create an array with the attributes .

For test purposes, simply change background=f3f3f3 to the value you want. Ideone does not allow HTACCESS, so there is no way to have an online example, but the execution was done as you wish.

HTACCESS

RewriteRule ^home/         /test.php
RewriteRule ^style/php.css /style.php

PHP

<?php
$argument = base64_encode( 'background=f3f3f3' );
?>

<link rel="stylesheet" type="text/css"
href="http://localhost/style/php.css?argument=<?php echo $argument;?>">

CSS

<?php
parse_str( base64_decode( $_GET['argument'] ) , $output );
?>

*{background:#<?php echo $output['background'] ;?>}

HTACCESS is accepting the URL http://localhost/home/ , I did not increase it to make it as educational as possible. You only need to create test.php and style.php .

Note that RewriteRule ^style/php.css /style.php would be as a rule only when you point the path to style/php.css always run style.php without other style sheets being redirected.

I do not know what your need to change CSS via PHP, I had this thought in a project, and I did it as you want. However it is not recommended to do so and neither is right.

I'd advise taking a look at JavaScript, Jquery. You could do this in just one line eg:

$(".nav-tabs > li.active > a").on('click', function(){
    $(this).css({'css', '#0e7363'});
});

Using this you can modify both CSS in PHP and direct in HTML etc.

Jquery documentation: link

How to use for CSS manipulation: link