How to implement recursive crawling of web page classes in PHP

This article mainly introduces the recursive crawling of web pages in PHP. It analyzes the techniques of PHP recursive operation and web page crawling with examples. It is of great practical value. Friends who need it can refer to the following examples.

This article explains the examples php implements the method of recursively crawling web page classes. The details are as follows:

<?php
class crawler{
 private $_depth=5;
 private $_urls=array();
 function extract_links($url)
 {
  if(!$this->_started){
   $this->_started=1;
   $curr_depth=0;
  }else{
   $curr_depth++;
  }
  if($curr_depth<$this->_depth)
  {
   $data=file_get_contents($url);
   if(preg_match_all(&#39;/((?:http|https)://(?:www.)*(?:[a-zA-Z0-9_-]{1,15}.+[a-zA-Z0-9_]{1,}){1,}(?:[a-zA-Z0-9_/.-?&:%,!;]*))/&#39;,$data,$urls12))
   {
    foreach($urls12[0] as $k=>$v){
     $check=get_headers($v,1);
     if(strstr($v,$url) && $check[0]==&#39;HTTP/1.1 200 OK&#39; && !array_search($v,$this->_urls) && $curr_depth<$this->_depth){
      $this->_urls[]=$v;
      $this->extract_links($v);
     }
    }
   }
  }
  return $this->_urls;
 }
}
?>

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