php正则替换处理HTML页面的方法_php技巧

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<?php
if(!defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * HTML替换处理类，考虑如下几种替换
  * 1. img src : '/<img(.+?)src=([\'\" ])?(.+?)([ >]+?)/i'
  * 2. a href : '/]+?)/i'
  * 3. ifram.src : '/<iframe(.+?)src=([\'\" ])?(.+?)([ >]+?)/i'
  * 4. frame src : '/<frame(.+?)src=([\'\" ])?(.+?)([ >]+?)/i'
  * 5. js  : '/window.open([( ]+?)([\'" ]+?)(.+?)([ )+?])/i'
  * 6. css  : '/background(.+?)url([( ])([\'" ]+?)(.+?)([ )+?])/i'
  */
 class Myreplace {
  private $moudle_array = array('udata','tdata','tresult','dresult');
  private $content;
  private $relative_dirname;
  private $projectid;
  private $moudle;
  function __construct() {
   $this->CI = &get_instance ();
  }
  /**
   * 替换
   * @param string $content HTML内容
   * @param string $relative 相对路径
   * @param int  $projectid 项目id
   * @moudle string $moudle  模板标识: udata,tdata,tresult,dresult
   */
  public function my_replace($content,$relative,$projectid,$moudle) {
   $this->content = $content;
   $this->relative_dirname = $relative;
   $this->projectid = $projectid;
   if(in_array(strtolower($moudle),$this->moudle_array))
    $this->moudle = $moudle;
   else exit;
   switch($this->moudle) {
    case 'udata':
     $this->CI->load->model('mupload_data','model');
     break;
    case 'tdata':
     $this->CI->load->model('taskdata','model');
     break;
    case 'tresult':
     $this->CI->load->model('taskresult','model');
     break;
    case 'dresult':
     $this->CI->load->model('dmsresult','model');
     break;
    default:
     break;
   }
   $pattern = '/<img(.+?)src=([\'\" ])?(.+?)([ >]+?)/i';
   $content = preg_replace_callback( $pattern, array($this, 'image_replace') , $content );
   $pattern = '/]+?)/i';
   $content = preg_replace_callback( $pattern, array($this, 'html_replace') , $content );
   $pattern = '/<iframe(.+?)src=([\'\" ])?(.+?)([ >]+?)/i';
   $content = preg_replace_callback( $pattern, array($this, 'iframe_replace') , $content );
   $pattern = '/<frame(.+?)src=([\'\" ])?(.+?)([ >]+?)/i'; 
   $content = preg_replace_callback( $pattern, array($this, 'frame_replace'), $content );
   $pattern = '/window.open([( ]+?)([\'" ]+?)(.+?)([ )]+?)/i';
   $content = preg_replace_callback( $pattern, array($this, 'js_replace'), $content );
   $pattern = '/background(.+?)url([( ])([\'" ]+?)(.+?)([ )+?])/i';
   $content = preg_replace_callback( $pattern, array($this, 'css_replace'), $content);
   return $content;
  }
  private function image_replace($matches) {
   if(count($matches) < 4) return '';
   if( empty($matches[3]) ) return '';
   $matches[3] = rtrim($matches[3],'\'"/');
   //获取图片的id
   $parent_dir_num = substr_count( $matches[3], '../');
   $relative_dirname = $this->relative_dirname;
   for($i=0; $i<$parent_dir_num; $i++) {
    $relative_dirname = substr( $relative_dirname, 0, strrpos($relative_dirname,"/") );
   }
   $relativepath = rtrim($relative_dirname,'/') . '/'.ltrim($matches[3],'./');
   $image_id = $this->CI->model->get_id_by_path_and_project($relativepath,$this->projectid);
   //