How to write css classes in php file?

I am creating some dynamic template and I have an issue that I开发者_运维知识库 want to use PHP variables in external CSS file.

Example: if stylesheet is styles.css and then I want to use this file as styles.php so that I can use variables in this file to make css dynamic.

What should I do for this. Thanks in advance.

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1. Rename file to styles.php (or configure server to run PHP interpreter in CSS files).

2. Send appropriate Content-Type header:

   header('Content-Type: text/css');
   

3. Write your code:

   <?php
   
   header('Content-Type: text/css');
   
   $a = '#123456';
   $b = '#654321';
   
   ?>
   
   body > a {
       color: <?php echo $a ?>;
   }
   

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Use an .htaccess file and the following line:

AddType application/x-httpd-php .css

This will make your server parse .css files as if they were .php.

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The problem with making dynamically generated CSS files is that they won't be cached. You'll be forcing to user to hit your server at least twice: once for the php output, and once for the css.

If you're only making a few minor parts of the CSS dynamic, consider creating a regular standard CSS file with suitable defaults in it, and then having your PHP pages output a suitable <style> block which issues the overrides. That way your main CSS file can be cached, and you get dynamic styles at the cost of a few lines of extra output in your PHP file.

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I know this is old but @MarcB is incorrect on caching

Here is a cachable version of the php CSS

<?php
  ob_start ("ob_gzhandler");
  header("Content-type: text/css; charset: UTF-8");
  header("Cache-Control: must-revalidate");
  $offset = 60 * 60 ;
  $ExpStr = "Expires: " .
  gmdate("D, d M Y H:i:s",
  time() + $offset) . " GMT";
  header($ExpStr);
  $blue="#00f";
  $red="#f00";
  $green="#0f0";
 ?>
  #div{
   color:<?=$blue?>;
   background:<?=$red?>
 }