How to compress and merge js in php

这篇文章主要介绍了php实现压缩合并js的方法,涉及php压缩文件类JSMin的相关调用与使用技巧,并附带了完整的demo源码供读者下载参考,需要的朋友可以参考下

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 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 {} ?>

总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。

相关推荐：

php实现URL加密解密

PHP版单点登陆实现方案

php实现背景图上添加圆形logo图标

The above is the detailed content of How to compress and merge js in php. For more information, please follow other related articles on the PHP Chinese website!