How to crawl and analyze php pages

This article mainly introduces the method of crawling and analyzing php pages. Interested friends can refer to it. I hope it will be helpful to everyone.

The details are as follows:

<?php
/**
 * 爬虫程序 -- 原型
 *
 * 从给定的url获取html内容
 * 
 * @param string $url 
 * @return string 
 */
function _getUrlContent($url) {
  $handle = fopen($url, "r");
  if ($handle) {
    $content = stream_get_contents($handle, 1024 * 1024);
    return $content;
  } else {
    return false;
  } 
} 
/**
 * 从html内容中筛选链接
 * 
 * @param string $web_content 
 * @return array 
 */
function _filterUrl($web_content) {
  $reg_tag_a = &#39;/<[a|A].*?href=[\&#39;\"]{0,1}([^>\&#39;\"\ ]*).*?>/&#39;;
  $result = preg_match_all($reg_tag_a, $web_content, $match_result);
  if ($result) {
    return $match_result[1];
  } 
} 
/**
 * 修正相对路径
 * 
 * @param string $base_url 
 * @param array $url_list 
 * @return array 
 */
function _reviseUrl($base_url, $url_list) {
  $url_info = parse_url($base_url);
  $base_url = $url_info["scheme"] . &#39;://&#39;;
  if ($url_info["user"] && $url_info["pass"]) {
    $base_url .= $url_info["user"] . ":" . $url_info["pass"] . "@";
  } 
  $base_url .= $url_info["host"];
  if ($url_info["port"]) {
    $base_url .= ":" . $url_info["port"];
  } 
  $base_url .= $url_info["path"];
  print_r($base_url);
  if (is_array($url_list)) {
    foreach ($url_list as $url_item) {
      if (preg_match(&#39;/^http/&#39;, $url_item)) {
        // 已经是完整的url
        $result[] = $url_item;
      } else {
        // 不完整的url
        $real_url = $base_url . &#39;/&#39; . $url_item;
        $result[] = $real_url;
      } 
    } 
    return $result;
  } else {
    return;
  } 
} 
/**
 * 爬虫
 * 
 * @param string $url 
 * @return array 
 */
function crawler($url) {
  $content = _getUrlContent($url);
  if ($content) {
    $url_list = _reviseUrl($url, _filterUrl($content));
    if ($url_list) {
      return $url_list;
    } else {
      return ;
    } 
  } else {
    return ;
  } 
} 
/**
 * 测试用主程序
 */
function main() {
  $current_url = "http://hao123.com/"; //初始url
  $fp_puts = fopen("url.txt", "ab"); //记录url列表
  $fp_gets = fopen("url.txt", "r"); //保存url列表
  do {
    $result_url_arr = crawler($current_url);
    if ($result_url_arr) {
      foreach ($result_url_arr as $url) {
        fputs($fp_puts, $url . "\r\n");
      } 
    } 
  } while ($current_url = fgets($fp_gets, 1024)); //不断获得url
} 
main();
?>

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

Related recommendations:

PHP generates csv files and downloads them and solves the problem

Using curl forgery in PHP Function of IP

PHP simulates the method of response class in asp

The above is the detailed content of How to crawl and analyze php pages. For more information, please follow other related articles on the PHP Chinese website!