PHP实现抓取百度搜索结果页面【相关搜索词】并存储到txt文件示例

本文实例讲述了PHP实现抓取百度搜索结果页面【相关搜索词】并存储到txt文件。分享给大家供大家参考，具体如下：

一、百度搜索关键词【安科网】

https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=0&rsv_idx=1&tn=baidu&wd=%E8%84%9A%E6%9C%AC%E4%B9%8B%E5%AE%B6&rsv_pq=ab33cfeb000086a2&rsv_t=7c65vT3KzHCNfGYOIn%2FDSS%2BOQUiCycaspxWzSOBfkHYpgRIPKMI74WIi8K8&rqlang=cn&rsv_enter=1&rsv_sug3=1

搜索结果部分源代码：

二、抓取并保存本地

源代码

index.php：

<form action="index.php" method="post">
<input name="q" type="text" />
<input type="submit" value="Get Keywords" />
</form>
<?php
header('Content-Type:text/html;charset=gbk');
class ComBaike{
  private $o_String=NULL;
  public function __construct(){
    include('cls.StringEx.php');
    $this->o_String=new StringEx();
  }
  public function getItem($word){
    $url = "http://www.baidu.com/s?wd=".$word;
    // 构造包头，模拟浏览器请求
    $header = array (
      "Host:www.baidu.com",
      "Content-Type:application/x-www-form-urlencoded",//post请求
      "Connection: keep-alive",
      'Referer:http://www.baidu.com',
      'User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; BIDUBrowser 2.6)'
    );
    $ch = curl_init ();
    curl_setopt ( $ch, CURLOPT_URL, $url );
    curl_setopt ( $ch, CURLOPT_HTTPHEADER, $header );
    curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );
    $content = curl_exec ( $ch );
    if ($content == FALSE) {
    echo "error:" . curl_error ( $ch );
    }
    curl_close ( $ch );
    //输出结果echo $content;
    $this->o_String->string=$content;
    $s_begin='<div id="rs">';
    $s_end='</div>';
    $summary=$this->o_String->getPart($s_begin,$s_end);
    $s_begin='<div class="tt">相关搜索</div><table cellpadding="0"><tr><th>';
    $s_end='</th></tr></table></div>';
    $content=$this->o_String->getPart($s_begin,$s_end);
    return $content;
  }
  public function __destruct(){
    unset($this->o_String);
  }
}
if($_POST){
  $com = new ComBaike();
  $q = $_POST['q'];
  $str = $com->getItem($q); //获取搜索内容
  $pat = '/<a(.*?)href="(.*?)" rel="external nofollow" (.*?)>(.*?)<\/a>/i';
  preg_match_all($pat, $str, $m);
  //print_r($m[4]); 链接文字
  $con = implode(",", $m[4]);
  //生成文件夹
  $dates = date("Ymd");
  $path="./Search/".$dates."/";
  if(!is_dir($path)){
    mkdir($path,0777,true);
  }
  //生成文件
  $file = fopen($path.iconv("UTF-8","GBK",$q).".txt",'w');
  if(fwrite($file,$con)){
    echo $con;
    echo '<script>alert("success")</script>';
  }else{
    echo '<script>alert("error")</script>';
  }
  fclose($file);
}
?>

cls.StringEx.php：

<?php
header('Content-Type: text/html; charset=UTF-8');
class StringEx{
  public $string='';
  public function __construct($string=''){
    $this->string=$string;
  }
  public function pregGetPart($s_begin,$s_end){
    $s_begin==preg_quote($s_begin);
    $s_begin=str_replace('/','\/',$s_begin);
    $s_end=preg_quote($s_end);
    $s_end=str_replace('/','\/',$s_end);
    $pattern='/'.$s_begin.'(.*?)'.$s_end.'/';
    $result=preg_match($pattern,$this->string,$a_match);
    if(!$result){
      return $result;
    }else{
      return isset($a_match[1])?$a_match[1]:'';
    }
  }
  public function strstrGetPart($s_begin,$s_end){
    $string=strstr($this->string,$s_begin);
    $string=strstr($string,$s_end,true);
    $string=str_replace($s_begin,'',$string);
    $string=str_replace($s_end,'',$string);
    return $string;
  }
  public function getPart($s_begin,$s_end){
    $result=$this->pregGetPart($s_begin,$s_end);
    if(!$result){
      $result=$this->strstrGetPart($s_begin,$s_end);
    }
    return $result;
  }
}
?>

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