php网页分析 内容抓取 爬虫 文件分析

php网页分析 内容抓取 爬虫 文件分析

(2011-11-19 20:53:10)转载▼

标签： 杂谈

//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");

$fp = fopen($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\r\n";

$header .= "Accept: *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."\n"; }

}

}

}

return $result;

}

//获取指定内容中的多媒体文件

function get_content_object($str, $split="|--:**:--|"){

$regx = "/href\s*=\s*['\"]*([^>'\"\s]+)[\"'>]*\s*(.*?<\/b>)/i";

preg_match_all($regx, $str, $result);

if (count($result) == 3){

$result[2] = str_replace("多媒体： ", "", $result[2]);

$result[2] = str_replace("", "", $result[2]);

$result = $result[1][0] . $split .$result[2][0] . "\n";

}

return $result;

}

?>

//PHP 访问网页

$page = '';

$handler = fopen('','r');

while(!feof($handler)){

$page.=fread($handler,1048576);

}

fclose($handler);

echo $page;

?>

2:判断这个页面是否是报错页面

function getHttpStatus($host,$get="") {

$fp = fsockopen($host, 80);

if (!$fp) {

$res= -1; } else {

fwrite($fp, "GET /".$get." HTTP/1.0\r\n\r\n");

stream_set_timeout($fp, 2);

$res = fread($fp, 128);

$info = stream_get_meta_data($fp);

fclose($fp);

if ($info['timed_out']) {

$res=0;

} else {

$res= substr($res,9,3);

}

}

return $res;

}

$good=array("200","302");

if(in_array(getHttpStatus("","/"),$good)) {

echo "正常";

} else {

echo getHttpStatus("","/");

}

if(in_array(getHttpStatus("","/error.php"),$good)) {

echo "正常";

} else {

echo getHttpStatus("","/error.php");

}

?>

返回

第一个返回"正常"

第二个不存在返回"404"

function getHttpStatus($host,$get="") {

//访问网页 获得服务器状态码

$fp = fsockopen($host, 80);

if (!$fp) {

$res= -1;

} else {

fwrite($fp, "GET /".$get." HTTP/1.0\r\n\r\n");

stream_set_timeout($fp, 2);

$res = fread($fp, 128);