[代码分享]PHP实现压缩多个CSS与JS文件的方法

最近一直在研究压缩css和js的方法,经测试下面的方法比较简单实用。

压缩CSS建立compress.php,代码如下:

?php   
header('Content-type: text/css');   
ob_start("compress");   
function compress($buffer) {   
    /* remove comments */   
    $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);   
    /* remove tabs, spaces, newlines, etc. */   
    $buffer = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $buffer);   
    return $buffer;   
}     
   
/* your css files */   
include('111.css');   
include('222.css');   
   
ob_end_flush();
?

其中111.css和222.css为要压缩的css文件。

使用方法:link href="compress.php" rel="stylesheet" type="text/css" /

压缩JS利用jsmin类: 建立compress.php文件,名字可随意更换,代码如下:

header('Content-type: text/javascript');   
require 'jsmin.php';   
echo JSMin::minify(file_get_contents('111.js') . file_get_contents('222.js'));
jsmin.php代码如下:
?php
/**
 * jsmin.php - PHP implementation of Douglas Crockford's JSMin.
 *
 * This is pretty much a direct port of jsmin.c to PHP with just a few
 * PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and
 * outputs to stdout, this library accepts a string as input and returns another
 * string as output.
 *
 * PHP 5 or higher is required.
 *
 * Permission is hereby granted to use this version of the library under the
 * same terms as jsmin.c, which has the following license:
 *
 * --
 * Copyright (c) 2002 Douglas Crockford  (www.crockford.com)
 *
 * 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 shall be used for Good, not Evil.
 *
 * 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.
 * --
 *
 * @package JSMin
 * @author Ryan Grove [email protected]
 * @copyright 2002 Douglas Crockford [email protected] (jsmin.c)
 * @copyright 2008 Ryan Grove [email protected] (PHP port)
 * @copyright 2012 Adam Goforth [email protected] (Updates)
 * @license http://opensource.org/licenses/mit-license.php MIT License
 * @version 1.1.2 (2012-05-01)
 * @link https://github.com/rgrove/jsmin-php
 */

class JSMin {
  const ORD_LF            = 10;
  const ORD_SPACE         = 32;
  const ACTION_KEEP_A     = 1;
  const ACTION_DELETE_A   = 2;
  const ACTION_DELETE_A_B = 3;

  protected $a           = '';
  protected $b           = '';
  protected $input       = '';
  protected $inputIndex  = 0;
  protected $inputLength = 0;
  protected $lookAhead   = null;
  protected $output      = '';

  // -- Public Static Methods --------------------------------------------------

  /**
   * Minify Javascript
   *
   * @uses __construct()
   * @uses min()
   * @param string $js Javascript to be minified
   * @return string
   */
  public static function minify($js) {
    $jsmin = new JSMin($js);
    return $jsmin-min();
  }

  // -- Public Instance Methods ------------------------------------------------

  /**
   * Constructor
   *
   * @param string $input Javascript to be minified
   */
  public function __construct($input) {
    $this-input       = str_replace("\r\n", "\n", $input);
    $this-inputLength = strlen($this-input);
  }

  // -- Protected Instance Methods ---------------------------------------------

  /**
   * Action -- do something! What to do is determined by the $command argument.
   *
   * action treats a string as a single character. Wow!
   * action recognizes a regular expression if it is preceded by ( or , or =.
   *
   * @uses next()
   * @uses get()
   * @throws JSMinException If parser errors are found:
   *         - Unterminated string literal
   *         - Unterminated regular expression set in regex literal
   *         - Unterminated regular expression literal
   * @param int $command One of class constants:
   *      ACTION_KEEP_A      Output A. Copy B to A. Get the next B.
   *      ACTION_DELETE_A    Copy B to A. Get the next B. (Delete A).
   *      ACTION_DELETE_A_B  Get the next B. (Delete B).
  */
  protected function action($command) {
    switch($command) {
      case self::ACTION_KEEP_A:
        $this-output .= $this-a;

      case self::ACTION_DELETE_A:
        $this-a = $this-b;

        if ($this-a === "'" || $this-a === '"') {
          for (;;) {
            $this-output .= $this-a;
            $this-a       = $this-get();

            if ($this-a === $this-b) {
              break;
            }

            if (ord($this-a) = self::ORD_LF) {
              throw new JSMinException('Unterminated string literal.');
            }

            if ($this-a === '\\') {
              $this-output .= $this-a;
              $this-a       = $this-get();
            }
          }
        }

      case self::ACTION_DELETE_A_B:
        $this-b = $this-next();

        if ($this-b === '/'  (
            $this-a === '(' || $this-a === ',' || $this-a === '=' ||
            $this-a === ':' || $this-a === '[' || $this-a === '!' ||
            $this-a === '' || $this-a === '|' || $this-a === '?' ||
            $this-a === '{' || $this-a === '}' || $this-a === ';' ||
            $this-a === "\n" )) {

          $this-output .= $this-a . $this-b;

          for (;;) {
            $this-a = $this-get();

            if ($this-a === '[') {
              /*
                inside a regex [...] set, which MAY contain a '/' itself. Example: mootools Form.Validator near line 460:
                  return Form.Validator.getValidator('IsEmpty').test(element) || (/^(?:[a-z0-9!#$%'*+/=?^_`{|}~-]\.?){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'));
              */
              for (;;) {
                $this-output .= $this-a;
                $this-a = $this-get();

                if ($this-a === ']') {
                    break;
                } elseif ($this-a === '\\') {
                  $this-output .= $this-a;
                  $this-a       = $this-get();
                } elseif (ord($this-a) = self::ORD_LF) {
                  throw new JSMinException('Unterminated regular expression set in regex literal.');
                }
              }
            } elseif ($this-a === '/') {
              break;
            } elseif ($this-a === '\\') {
              $this-output .= $this-a;
              $this-a       = $this-get();
            } elseif (ord($this-a) = self::ORD_LF) {
              throw new JSMinException('Unterminated regular expression literal.');
            }

            $this-output .= $this-a;
          }

          $this-b = $this-next();
        }
    }
  }

  /**
   * Get next char. Convert ctrl char to space.
   *
   * @return string|null
   */
  protected function get() {
    $c = $this-lookAhead;
    $this-lookAhead = null;

    if ($c === null) {
      if ($this-inputIndex  $this-inputLength) {
        $c = substr($this-input, $this-inputIndex, 1);
        $this-inputIndex += 1;
      } 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 {}
?
调用方法:script type="text/javascript" src="compress.php"/script

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原文地址《[代码分享]PHP实现压缩多个CSS与JS文件的方法

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