本文实例讲述了php实现压缩多个CSS与JS文件的方法。分享给大家供大家参考。具体实现方法如下：
1. 压缩css
<?php <br />header('Content-type: text/css'); <br />ob_start("compress"); <br />function compress($buffer) { <br /> /* remove comments */ <br /> $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer); <br /> /* remove tabs, spaces, newlines, etc. */ <br /> $buffer = str_replace(array("\r\n", "\r", "\n", "\t", ' ', ' ', ' '), '', $buffer); <br /> return $buffer; <br />} <br /> <br />/* your css files */ <br />include('galleria.css'); <br />include('articles.css'); <br /> <br />ob_end_flush();
使用方法如下:
<link href="compress.php" rel="stylesheet" type="text/css" /><span id="tester">test</span>
2. 压缩js,利用jsmin类:
本实例源自:http://code.google.com/p/minify/
header('Content-type: text/javascript'); <br />require 'jsmin.php'; <br />echo JSMin::minify(file_get_contents('common.js') . file_get_contents('common2.js'));
其中jsmin.php文件如下：
<br /><?php<br />/**<br /> * jsmin.php - PHP implementation of Douglas Crockford's JSMin.<br /> *<br /> * This is pretty much a direct port of jsmin.c to PHP with just a few<br /> * PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and<br /> * outputs to stdout, this library accepts a string as input and returns another<br /> * string as output.<br /> *<br /> * PHP 5 or higher is required.<br /> *<br /> * Permission is hereby granted to use this version of the library under the<br /> * same terms as jsmin.c, which has the following license:<br /> *<br /> * --<br /> * Copyright (c) 2002 Douglas Crockford (www.crockford.com)<br /> *<br /> * Permission is hereby granted, free of charge, to any person obtaining a copy of<br /> * this software and associated documentation files (the "Software"), to deal in<br /> * the Software without restriction, including without limitation the rights to<br /> * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies<br /> * of the Software, and to permit persons to whom the Software is furnished to do<br /> * so, subject to the following conditions:<br /> *<br /> * The above copyright notice and this permission notice shall be included in all<br /> * copies or substantial portions of the Software.<br /> *<br /> * The Software shall be used for Good, not Evil.<br /> *<br /> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR<br /> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,<br /> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE<br /> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER<br /> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,<br /> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE<br /> * SOFTWARE.<br /> * --<br /> *<br /> * @package JSMin<br /> * @author Ryan Grove <br /> * @copyright 2002 Douglas Crockford (jsmin.c)<br /> * @copyright 2008 Ryan Grove (PHP port)<br /> * @copyright 2012 Adam Goforth (Updates)<br /> * @license http://opensource.org/licenses/mit-license.php MIT License<br /> * @version 1.1.2 (2012-05-01)<br /> * @link https://github.com/rgrove/jsmin-php<br /> */<br />class JSMin {<br /> const ORD_LF = 10;<br /> const ORD_SPACE = 32;<br /> const ACTION_KEEP_A = 1;<br /> const ACTION_DELETE_A = 2;<br /> const ACTION_DELETE_A_B = 3;<br /> protected $a = '';<br /> protected $b = '';<br /> protected $input = '';<br /> protected $inputIndex = 0;<br /> protected $inputLength = 0;<br /> protected $lookAhead = null;<br /> protected $output = '';<br /> // -- Public Static Methods --------------------------------------------------<br /> /**<br /> * Minify Javascript<br /> *<br /> * @uses __construct()<br /> * @uses min()<br /> * @param string $js Javascript to be minified<br /> * @return string<br /> */<br /> public static function minify($js) {<br /> $jsmin = new JSMin($js);<br /> return $jsmin->min();<br /> }<br /> // -- Public Instance Methods ------------------------------------------------<br /> /**<br /> * Constructor<br /> *<br /> * @param string $input Javascript to be minified<br /> */<br /> public function __construct($input) {<br /> $this->input = str_replace("\r\n", "\n", $input);<br /> $this->inputLength = strlen($this->input);<br /> }<br /> // -- Protected Instance Methods ---------------------------------------------<br /> /**<br /> * Action -- do something! What to do is determined by the $command argument.<br /> *<br /> * action treats a string as a single character. Wow!<br /> * action recognizes a regular expression if it is preceded by ( or , or =.<br /> *<br /> * @uses next()<br /> * @uses get()<br /> * @throws JSMinException If parser errors are found:<br /> * - Unterminated string literal<br /> * - Unterminated regular expression set in regex literal<br /> * - Unterminated regular expression literal<br /> * @param int $command One of class constants:<br /> * ACTION_KEEP_A Output A. Copy B to A. Get the next B.<br /> * ACTION_DELETE_A Copy B to A. Get the next B. (Delete A).<br /> * ACTION_DELETE_A_B Get the next B. (Delete B).<br /> */<br /> protected function action($command) {<br /> switch($command) {<br /> case self::ACTION_KEEP_A:<br /> $this->output .= $this->a;<br /> case self::ACTION_DELETE_A:<br /> $this->a = $this->b;<br /> if ($this->a === "'" || $this->a === '"') {<br /> for (;;) {<br /> $this->output .= $this->a;<br /> $this->a = $this->get();<br /> if ($this->a === $this->b) {<br /> break;<br /> }<br /> if (ord($this->a) <= self::ORD_LF) {<br /> throw new JSMinException('Unterminated string literal.');<br /> }<br /> if ($this->a === '\\') {<br /> $this->output .= $this->a;<br /> $this->a = $this->get();<br /> }<br /> }<br /> }<br /> case self::ACTION_DELETE_A_B:<br /> $this->b = $this->next();<br /> if ($this->b === '/' && (<br /> $this->a === '(' || $this->a === ',' || $this->a === '=' ||<br /> $this->a === ':' || $this->a === '[' || $this->a === '!' ||<br /> $this->a === '&' || $this->a === '|' || $this->a === '?' ||<br /> $this->a === '{' || $this->a === '}' || $this->a === ';' ||<br /> $this->a === "\n" )) {<br /> $this->output .= $this->a . $this->b;<br /> for (;;) {<br /> $this->a = $this->get();<br /> if ($this->a === '[') {<br /> /*<br /> inside a regex [...] set, which MAY contain a '/' itself. Example: mootools Form.Validator near line 460:<br /> return Form.Validator.getValidator('IsEmpty').test(element) || (/^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]\.?){0,63}[a-z0-9!#$%&'*+/=?^_`{|}~-]@(?:(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)*[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\])$/i).test(element.get('value'));<br /> */<br /> for (;;) {<br /> $this->output .= $this->a;<br /> $this->a = $this->get();<br /> if ($this->a === ']') {<br /> break;<br /> } elseif ($this->a === '\\') {<br /> $this->output .= $this->a;<br /> $this->a = $this->get();<br /> } elseif (ord($this->a) <= self::ORD_LF) {<br /> throw new JSMinException('Unterminated regular expression set in regex literal.');<br /> }<br /> }<br /> } elseif ($this->a === '/') {<br /> break;<br /> } elseif ($this->a === '\\') {<br /> $this->output .= $this->a;<br /> $this->a = $this->get();<br /> } elseif (ord($this->a) <= self::ORD_LF) {<br /> throw new JSMinException('Unterminated regular expression literal.');<br /> }<br /> $this->output .= $this->a;<br /> }<br /> $this->b = $this->next();<br /> }<br /> }<br /> }<br /> /**<br /> * Get next char. Convert ctrl char to space.<br /> *<br /> * @return string|null<br /> */<br /> protected function get() {<br /> $c = $this->lookAhead;<br /> $this->lookAhead = null;<br /> if ($c === null) {<br /> if ($this->inputIndex inputLength) {<br /> $c = substr($this->input, $this->inputIndex, 1);<br /> $this->inputIndex += 1;<br /><div>本文来*源gaodai^.ma#com搞#代!码网</div><pre>搞gaodaima代码
} else {
$c = null;
}
}
if ($c === “\r”) {
return “\n”;
}
if ($c === null || $c === “\n” || ord($c) >= self::ORD_SPACE) {
return $c;
}
return ‘ ‘;
}
/**
* Is $c a letter, digit, underscore, dollar sign, or non-ASCII character.
*
* @return bool
*/
protected function isAlphaNum($c) {
return ord($c) > 126 || $c === ‘\\’ || preg_match(‘/^[\w\$]$/’, $c) === 1;
}
/**
* Perform minification, return result
*
* @uses action()
* @uses isAlphaNum()
* @uses get()
* @uses peek()
* @return string
*/
protected function min() {
if (0 == strncmp($this->peek(), “\xef”, 1)) {
$this->get();
$this->get();
$this->get();
}
$this->a = “\n”;
$this->action(self::ACTION_DELETE_A_B);
while ($this->a !== null) {
switch ($this->a) {
case ‘ ‘:
if ($this->isAlphaNum($this->b)) {
$this->action(self::ACTION_KEEP_A);
} else {
$this->action(self::ACTION_DELETE_A);
}
break;
case “\n”:
switch ($this->b) {
case ‘{‘:
case ‘[‘:
case ‘(‘:
case ‘+’:
case ‘-‘:
case ‘!’:
case ‘~’:
$this->action(self::ACTION_KEEP_A);
break;
case ‘ ‘:
$this->action(self::ACTION_DELETE_A_B);
break;
default:
if ($this->isAlphaNum($this->b)) {
$this->action(self::ACTION_KEEP_A);
}
else {
$this->action(self::ACTION_DELETE_A);
}
}
break;
default:
switch ($this->b) {
case ‘ ‘:
if ($this->isAlphaNum($this->a)) {
$this->action(self::ACTION_KEEP_A);
break;
}
$this->action(self::ACTION_DELETE_A_B);
break;
case “\n”:
switch ($this->a) {
case ‘}’:
case ‘]’:
case ‘)’:
case ‘+’:
case ‘-‘:
case ‘”‘:
case “‘”:
$this->action(self::ACTION_KEEP_A);
break;
default:
if ($this->isAlphaNum($this->a)) {
$this->action(self::ACTION_KEEP_A);
}
else {
$this->action(self::ACTION_DELETE_A_B);
}
}
break;
default:
$this->action(self::ACTION_KEEP_A);
break;
}
}
}
return $this->output;
}
/**
* Get the next character, skipping over comments. peek() is used to see
* if a ‘/’ is followed by a ‘/’ or ‘*’.
*
* @uses get()
* @uses peek()
* @throws JSMinException On unterminated comment.
* @return string
*/
protected function next() {
$c = $this->get();
if ($c === ‘/’) {
switch($this->peek()) {
case ‘/’:
for (;;) {
$c = $this->get();
if (ord($c) <= self::ORD_LF) {
return $c;
}
}
case ‘*’:
$this->get();
for (;;) {
switch($this->get()) {
case ‘*’:
if ($this->peek() === ‘/’) {
$this->get();
return ‘ ‘;
}
break;
case null:
throw new JSMinException(‘Unterminated comment.’);
}
}
default:
return $c;
}
}
return $c;
}
/**
* Get next char. If is ctrl character, translate to a space or newline.
*
* @uses get()
* @return string|null
*/
protected function peek() {
$this->lookAhead = $this->get();
return $this->lookAhead;
}
}
// — Exceptions —————————————————————
class JSMinException extends Exception {}
?>
希望本文所述对大家的php程序设计有所帮助。
转载请注明原文链接：php实现压缩多个CSS与JS文件的方法_php技巧
