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： * @copyright 2002 Douglas Crockford (jsmin.c) * @copyright 2008 Ryan Grove (PHP port) * @copyright 2012 Adam Goforth (Updates) * @license http://opensource.org/licenses/mit-license.php MIT License * @version 1.1.2 (2012-05-01) * @link http://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 {} ?> 完整实例代码点击此处本站下载。 更多关于PHP相关内容感兴趣的读者可查看本站专题：《php文件操作总结》、《PHP目录操作技巧汇总》、《PHP基本语法入门教程》、《PHP运算与运算符用法总结》、《php面向对象程序设计入门教程》、《PHP网络编程技巧总结》、《php字符串(string)用法总结》、《PHP数组(Array)操作技巧大全》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》 希望本文所述对大家PHP程序设计有所帮助。