php实现压缩合并js的方法【附demo源码下载】

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（"
", "
", $input）;$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 $command One of class constants:* ACTION_KEEP_A Output A. Copy B to A. Get the next B.* ACTION_DELETE_ACopy B to A. Get the next B. （Delete A）.* ACTION_DELETE_A_B Get the next B. （Delete B）. */ protected function action（$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 === "
" ）） { $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 === "
"） { return "
";}if （$c === null || $c === "
" || ord（$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（）;} $this->a = "
";$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 "
": 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; } $this->action（self::ACTION_DELETE_A_B）; break;case "
": switch （$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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