使用PHP简单网页抓取和内容分析

没事的时候想抓取点网页看看，也不太懂，只是玩玩，写了点代码，聊以娱乐。

稍微有点意义的函数是：get_content_by_socket(), get_url(), get_content_url(), get_content_object 几个函数，也许能够给你点什么想法。


<?php

//获取所有内容url保存到文件
function get_index($save_file, $prefix="index_"){
$count = 68;
$i = 1;
if (file_exists($save_file)) @unlink($save_file);
$fp = fopen($save_file, "a+") or die("Open ". $save_file ." failed");
while($i<$count){
$url = $prefix . $i .".htm";
echo "Get ". $url ."...";
$url_str = get_content_url(get_url($url));
echo " OK\n";
fwrite($fp, $url_str);
++$i;
}
fclose($fp);
}

//获取目标多媒体对象
function get_object($url_file, $save_file, $split="|--:**:--|"){
if (!file_exists($url_file)) die($url_file ." not exist");
$file_arr = file($url_file);
if (!is_array($file_arr) || empty($file_arr)) die($url_file ." not content");
$url_arr = array_unique($file_arr);
if (file_exists($save_file)) @unlink($save_file);
$fp = fopen($save_file, "a+") or die("Open save file ". $save_file ." failed");
foreach($url_arr as $url){
if (empty($url)) continue;
echo "Get ". $url ."...";
$html_str = get_url($url);
echo $html_str;
echo $url;
exit;
$obj_str = get_content_object($html_str);
echo " OK\n";
fwrite($fp, $obj_str);
}
fclose($fp);
}

//遍历目录获取文件内容
function get_dir($save_file, $dir){
$dp = opendir($dir);
if (file_exists($save_file)) @unlink($save_file);
$fp = fopen($save_file, "a+") or die("Open save file ". $save_file ." failed");
while(($file = readdir($dp)) != false){
if ($file!="." && $file!=".."){
echo "Read file ". $file ."...";
$file_content = file_get_contents($dir . $file);
$obj_str = get_content_object($file_content);
echo " OK\n";
fwrite($fp, $obj_str);
}
}
fclose($fp);
}


//获取指定url内容
function get_url($url){
$reg = '/^http:\/\/[^\/].+$/';
if (!preg_match($reg, $url)) die($url ." invalid");
转自：伊图教程网[www.etoow.com]$fp = fopen($url, "r") or die("Open url: ". $url ." failed.");
while($fc = fread($fp, 8192)){
$content .= $fc;
}
fclose($fp);
if (empty($content)){
die("Get url: ". $url ." content failed.");
}
return $content;
}

//使用socket获取指定网页
function get_content_by_socket($url, $host){
$fp = fsockopen($host, 80) or die("Open ". $url ." failed");
$header = "GET /".$url ." HTTP/1.1 ";
$header .= "Accept: */* ";
$header .= "Accept-Language: zh-cn ";
$header .= "Accept-Encoding: gzip, deflate ";
$header .= "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; InfoPath.1; .NET CLR 2.0.50727) ";
$header .= "Host: ". $host ." ";
$header .= "Connection: Keep-Alive ";
//$header .= "Cookie: cnzz02=2; rtime=1; ltime=1148456424859; cnzz_eid=56601755- ";
$header .= "Connection: Close ";

fwrite($fp, $header);
while (!feof($fp)) {
$contents .= fgets($fp, 8192);
}
fclose($fp);
return $contents;
}


//获取指定内容里的url
function get_content_url($host_url, $file_contents){

//$reg = '/^(#|javascript.*?|ftp://.+|http://.+|.*?href.*?|play.*?|index.*?|.*?asp)+$/i';
//$reg = '/^(down.*?.html|d+_d+.htm.*?)$/i';
$rex = "/([hH][rR][eE][Ff])s*=s*['"]*([^>'"s]+)["'>]*s*/i";
$reg = '/^(down.*?.html)$/i';
preg_match_all ($rex, $file_contents, $r);
$result = ""; //array();
foreach($r as $c){
if (is_array($c)){
foreach($c as $d){
if (preg_match($reg, $d)){ $result .= $host_url . $d." "; }
}
}
}
return $result;
}

//获取指定内容中的多媒体文件
function get_content_object($str, $split="|--:**:--|"){
$regx = "/hrefs*=s*['"]*([^>'"s]+)["'>]*s*(<b>.*?</b>)/i";
preg_match_all($regx, $str, $result);

if (count($result) == 3){
$result[2] = str_replace("<b>多媒体： ", "", $result[2]);
$result[2] = str_replace("</b>", "", $result[2]);
$result = $result[1][0] . $split .$result[2][0] . " ";
}
return $result;
}

?>