本文实例讲述了php实现压缩合并js的方法。分享给大家供大家参考，具体如下：

test.php文件如下：

require_once('jsmin.php'); $files = glob("js/*.js"); $js = ""; foreach($files as $file) { $js .= JSMin::minify(file_get_contents($file)); } file_put_contents("combined.js", $js); echo "success";

jsmin.php文件如下：

<?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 <ryan@wonko.com> * @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c) * @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port) * @copyright 2012 Adam Goforth <aag@adamgoforth.com> (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("rn", "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 {} ?>

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希望本文所述对大家PHP程序设计有所帮助。