Question

How can I minify a .php file with CSS contents?
Currently I get a 400 error.

Normally I call minify like this

<link rel="stylesheet" type="text/css" 
       href="{$workspace}/min/f=workspace/css/common.css" />

EDIT

The answer is changing the minify source code, but what is the change I should make?

In other words.. this call should work and process as CSS..

<link rel="stylesheet" type="text/css" 
      href="{$workspace}/min/f=workspace/css/common.php" />

Maybe with an optional declaration?

<link rel="stylesheet" type="text/css" 
href="{$workspace}/min/f=workspace/css/common.php&type=css" />

EDIT

I created the project here @ https://github.com/into/less-less

Answer 1

Your CSS+PHP script outputs CSS only after it’s requested from a server and parsed by PHP. Minify reads files directly from the server, skipping the HTTP request. So I see two paths:

1. Less optimal [?]: make minify download the CSS like this:

   <link rel="stylesheet" type="text/css" href="{$workspace}/min/f=http://site.com/workspace/css/common.php" />
   

2. Include Minify lib in your common.php file and use its classes (e.g. Minify_CSS) before output. Something like echo Minify_CSS::minify($css)

Update:

Your example repo contains a strange file name which wouldn’t let me pull/push appropriately, so here’s the changed report.php:

<pre>
<strong>LESS in</strong>
<?= file_get_contents('workspace/less/common.less') ?>
- - - - -
<strong>CSS out</strong>
<?
require 'workspace/php/lessc.inc.php';
$lc = new lessc();
$contents = file_get_contents( 'workspace/less/common.less' );
$css = $lc->parse( $contents );
echo $css;
?>
<strong>Minified</strong>
<?php
require 'workspace/min/lib/Minify/CSS/Compressor.php';
echo Minify_CSS_Compressor::process($css);
?>
</pre>