**功能：** 1.获取内容中的url，email，image。 2.替换内容中的url，email，image。 url：<a href="url">xxx</a> email：admin@admin.com image：<img src="image"> **Grep.class.php** ~~~ <?php /**grep class *Date: 2013-06-15 *Author: fdipzone *Ver: 1.0 * *Func: * *set: 设置内容 *get: 返回指定的内容 *replace: 返回替换后的内容 *get_pattern 根据type返回pattern */ class Grep{ // class start private $_pattern = array( 'url' => '/<a.*?href="((http(s)?:\/\/).*?)".*?/si', 'email' => '/([\w\-\.]+@[\w\-\.]+(\.\w+))/', 'image' => '/<img.*?src=\"(http:\/\/.+\.(jpg|jpeg|gif|bmp|png))\">/i' ); private $_content = ''; // 源内容 /* 設置搜尋的內容 * @param String $content */ public function set($content=''){ $this->_content = $content; } /* 获取指定内容 * @param String $type * @param int $unique 0:all 1:unique * @return Array */ public function get($type='', $unique=0){ $type = strtolower($type); if($this->_content=='' || !in_array($type, array_keys($this->_pattern))){ return array(); } $pattern = $this->get_pattern($type); // 获取pattern preg_match_all($pattern, $this->_content, $matches); return isset($matches[1])? ( $unique==0? $matches[1] : array_unique($matches[1]) ) : array(); } /* 获取替换后的内容 * @param String $type * @param String $callback * @return String */ public function replace($type='', $callback=''){ $type = strtolower($type); if($this->_content=='' || !in_array($type, array_keys($this->_pattern)) || $callback==''){ return $this->_content; } $pattern = $this->get_pattern($type); return preg_replace_callback($pattern, $callback, $this->_content); } /* 根据type获取pattern * @param String $type * @return String */ private function get_pattern($type){ return $this->_pattern[$type]; } } // class end ?> ~~~ **Demo** ~~~ <?php header('content-type:text/htm;charset=utf8'); require('Grep.class.php'); $content = file_get_contents('http://www.test.com/'); $obj = new Grep(); $obj->set($content); $url = $obj->get('url', 0); $email = $obj->get('email', 1); $image = $obj->get('image', 1); print_r($url); print_r($email); print_r($image); $url_new = $obj->replace('url', 'replace_url'); echo $url_new; function replace_url($matches){ return isset($matches[1])? '[url]'.$matches[1].'[/url]' : ''; } ?> ~~~