/php/common.php

<?php
/************************************************************************ 
 * CSS and Javascript Combinator 0.5
 * Copyright 2006 by Niels Leenheer 
 * 
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the 
 * "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, 
 * distribute, sublicense, and/or sell copies of the Software, and to 
 * permit persons to whom the Software is furnished to do so, subject to 
 * the following conditions: 
 *	
 * The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software. 
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
 */ 
function combine($type, $elements, $base, $cache, $cachedir){
	// Determine last modification date of the files 
	$lastmodified = 0;
	$s = ""; 
	while (list(,$element) = each($elements)) {
		$s .= $element . ','; 
		$path = realpath($base . '/' . $element);
		$lastmodified = max($lastmodified, filemtime($path)); 
	} 

	// Send Etag hash 
	$hash = $lastmodified . '-' . md5($s);
	if (strlen($hash) > 60)
		$hash = substr($hash, 0, 60);
	header ("Etag: \"" . $hash . "\""); 
	 
	if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
		stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) == '"' . $hash . '"')
	{
		// Return visit and no modifications, so do not send anything 
		header ("HTTP/1.0 304 Not Modified"); 
		header ('Content-Length: 0'); 
	}	
	else	
	{ 
		// First time visit or files were modified 
		if ($cache)
		{ 
			// Determine supported compression method
			$gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip');
			$deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate');
	
			// Determine used compression method
			$encoding = $gzip ? 'gzip' : ($deflate ? 'deflate' : 'none');
	
			// Check for buggy versions of Internet Explorer
			if (!strstr($_SERVER['HTTP_USER_AGENT'], 'Opera') && 
				preg_match('/^Mozilla\/4\.0 \(compatible; MSIE ([0-9]\.[0-9])/i', $_SERVER['HTTP_USER_AGENT'], $matches)) {
				$version = floatval($matches[1]);
							
				if ($version < 6)
					$encoding = 'none';
									
				if ($version == 6 && !strstr($_SERVER['HTTP_USER_AGENT'], 'EV1')) 
					$encoding = 'none';
				}
					
				// Try the cache first to see if the combined files were already generated 
				$cachefile = 'cache-' . $hash . '.' . $type . ($encoding != 'none' ? '.' . $encoding : '');
					
				if (file_exists($cachedir . '/' . $cachefile)) { 
					if ($fp = fopen($cachedir . '/' . $cachefile, 'rb')) { 
	
						if ($encoding != 'none') {
							header ("Content-Encoding: " . $encoding);
						}
								 
						header ("Content-Type: text/" . $type); 
						header ("Content-Length: " . filesize($cachedir . '/' . $cachefile));
				 
						fpassthru($fp); 
						fclose($fp); 
						exit; 
					} 
				} 
			} 
	 
			// Get contents of the files 
			$contents = ''; 
			reset($elements); 
			while (list(,$element) = each($elements)) { 
				$contents .= "\n\n";
				$path = realpath($base . '/' . $element);
				$file = @fopen($path, 'r');
				while (!feof($file)){
					$buffer = trim(fgets($file));
					if ($buffer{0} == '*' || ($buffer{0} == '/' && 
						($buffer{1} == '*' || $buffer{1} == '/')))
						continue;
					$contents .= $buffer . "\n";
				} 
			} 
	 
			// Send Content-Type 
			header ("Content-Type: text/" . $type); 
			 
			if (isset($encoding) && $encoding != 'none') 
			{ 
				// Send compressed contents 
				$contents = gzencode($contents, 9, $gzip ? FORCE_GZIP : FORCE_DEFLATE); 
				header ("Content-Encoding: " . $encoding); 
				header ('Content-Length: ' . strlen($contents)); 
				echo $contents; 
			}	
			else	
			{ 
				// Send regular contents 
				header ('Content-Length: ' . strlen($contents)); 
				echo $contents; 
			} 
	
			// Store cache 
			if ($cache) { 
				if ($fp = fopen($cachedir . '/' . $cachefile, 'wb')) { 
					fwrite($fp, $contents); 
					fclose($fp); 
				} 
			} 
	}
}
?>