1: <?php
 2: /**
 3:  * Designed to allow caching
 4:  *
 5:  * @author Mike Schinkel <mike@newclarity.net>
 6:  *
 7:  */
 8: /**
 9:  * @param string $css_dir
10:  */
11: function output_css( $css_dir ) {
12:   $files = headers( array(
13:     'css_dir' => $css_dir,
14:     'color_scheme' => filter_input( INPUT_GET, 'color', FILTER_SANITIZE_STRING ),
15:     'cache_seconds' =>  filter_input( INPUT_GET, 'cache', FILTER_SANITIZE_NUMBER_INT ),
16:    ));
17:   body( $files );
18: }
19: /**
20:  * @param array $args
21:  *
22:  * @return array Files
23:  */
24: function headers( $args ) {
25:   header( "Content-type: text/css" );
26: 
27:   if ( empty( $args['color_scheme'] ) )
28:     $args['color_scheme'] = 'grey';
29:   if ( empty( $args['cache_seconds'] ) )
30:     $args['cache_seconds'] = 3600;
31: 
32:   $files = array();
33:   $files[0] = "{$args['css_dir']}/styles.css";
34:   $files[1] = "{$args['css_dir']}/styles-{$args['color_scheme']}.css";
35: 
36:   $file_time = filemtime( __FILE__ );
37:   foreach( $files as $file )
38:     if ( $file_time < ( $new_file_time = filemtime( $file ) ) )
39:       $file_time = $new_file_time;
40: 
41:   $time_string = format_gmt_string( $file_time );
42:   $timeout = format_gmt_string( time() + (int)$args['cache_seconds'] );
43:   $etag = (string)$file_time;
44: 
45:   $modified = true;
46:   $matched = false;
47: 
48:   if ( ! empty( $_SERVER['HTTP_IF_NONE_MATCH'] ) )
49:     $matched = $etag == trim( $_SERVER['HTTP_IF_NONE_MATCH'], '"' );
50: 
51:   if ( ! empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) )
52:     $modified = $time_string != $_SERVER['HTTP_IF_MODIFIED_SINCE'];
53: 
54:   if ( $matched || ! $modified ) {
55:     header('HTTP/1.1 304 Not Modified');
56:     exit();
57:   } else {
58:     header( "Cache-Control: public, max-age={$args['cache_seconds']}" );
59:     header( "Last-Modified: {$time_string}" );
60:     header( "ETag: \"{$file_time}\"" );
61:     header( "Expires: {$timeout}" );
62:     header( "Connection: close" );
63:   }
64:   return $files;
65: }
66: /**
67:  * Loads contents of CSS files and then echos them out.
68:  *
69:  * @param array $files
70:  */
71: function body( $files ) {
72:   foreach( $files as $file ) {
73:     if ( file_exists( $file ) ) {
74:       echo file_get_contents( $file );
75:     }
76:   }
77: }
78: /**
79:  * @param datetime $datetime
80:  * @return string
81:  */
82: function format_gmt_string( $datetime ) {
83:   return gmdate( 'D, d M Y H:i:s ', $datetime ) . 'GMT';
84: }
85: 
86: