PHP 下载远程网页图片并且保存在本地实例

发布:smiling　来源: PHP粉丝网　添加日期：2014-07-21 11:22:03　浏览: 评论：0　

我们要取远程服务器中网页的图片然后保存到我们本地需要珍到php fopen或curl等等这类的函数,下面我给大家介绍几个常用的实例.

fopen函数实例

ob_start:打开输出缓冲

readfile:读入一个文件并写入到输出缓冲

返回从文件中读入的字节数,如果出错返回 FALSE 并且除非是以 @readfile() 形式调用,否则会显示错误信息.

ob_get_contents : Return the contents of the output buffer(返回输出缓冲的内容)

This will return the contents of the output buffer without clearing it or FALSE, if output buffering isn’t active.(如果输出缓冲没有活动(打开),则返回 FALSE)

ob_end_clean() : Clean (erase) the output buffer and turn off output buffering(清除输出缓冲)

代码如下:

<?php

//URL是远程的完整图片地址，不能为空, $filename 是另存为的图片名字

//默认把图片放在以此脚本相同的目录里

function GrabImage($url,$filename=""){

        if($url == ""){

            return false;

        }



        $ext=strrchr($url,".");



        if($ext != ".gif" && $ext != ".jpg" && $ext != ".bmp" && $ext != ".png"){

            echo "格式不支持！";

            return false;

        }



        if($filename == ""){

            $filename = time()."$ext";

        }



        ob_start();

        readfile($url);

        $img=ob_get_contents();

        ob_end_clean();

        $size=strlen($img);

        $fp2=fopen($filename,"a");

        if(fwrite($fp2,$img) === false){

            echo "不能写入文件".$filename;

            exit();

        }else{

            echo "保存图片成功！";

        }

        fclose($fp2);

        return $filename;



    }

//测试

GrabImage("/logo.png","as.png");

?>

php下载远程图片函数,可伪造来路.

$gurl 要下载的图片地址

$rfurl 来路。如果目标图像做了防盗链设置，可以绕过。

$filename 下载图片保存的文件名，相对路径，不要用realpath

$gcookie 调整cookie 伪造的cookie

$JumpCount 跳转计数

$maxtime 最大次数

调用方法:

DownImageKeep(“http://www.baidu.com/img/baidu_jgylogo2.gif”,”http://baidu.com”,”a.gif”,”",0,10);

代码如下:

function DownImageKeep($gurl, $rfurl, $filename, $gcookie=”", $JumpCount=0, $maxtime=30)

{

$urlinfos = GetHostInfo($gurl);

$ghost = trim($urlinfos['host']);

if($ghost==”)

{

return FALSE;

}

$gquery = $urlinfos['query'];

if($gcookie==”" && !emptyempty($rfurl))

{

$gcookie = RefurlCookie($rfurl);

}

$sessionQuery = “GET $gquery HTTP/1.1rn”;

$sessionQuery .= “Host: $ghostrn”;

$sessionQuery .= “Referer: $rfurlrn”;

$sessionQuery .= “Accept: */*rn”;

$sessionQuery .= “User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)rn”;

if($gcookie!=”" && !preg_match(“/[rn]/”, $gcookie))

{

$sessionQuery .= $gcookie.”rn”;

}

$sessionQuery .= “Connection: Keep-Alivernrn”;

$errno = “”;

$errstr = “”;

$m_fp = fsockopen($ghost, 80, $errno, $errstr,10);

fwrite($m_fp,$sessionQuery);

$lnum = 0;

//获取应答头

$m_httphead = Array();

$httpstas = explode(” “,fgets($m_fp,256));

$m_httphead["http-edition"] = trim($httpstas[0]);

$m_httphead["http-state"] = trim($httpstas[1]);

while(!feof($m_fp))

{

$line = trim(fgets($m_fp,256));

if($line == “” || $lnum>100)

{

break;

}

$hkey = “”;

$hvalue = “”;

$v = 0;

for($i=0; $i {

if($v==1)

{

$hvalue .= $line[$i];

}

if($line[$i]==”:”)

{

$v = 1;

}

if($v==0)

{

$hkey .= $line[$i];

}

}

$hkey = trim($hkey);

if($hkey!=”")

{

$m_httphead[strtolower($hkey)] = trim($hvalue);

}

}

if(preg_match(“/^3/”, $m_httphead["http-state"]))

{

if(isset($m_httphead["location"]) && $JumpCount<3) { $JumpCount++; DownImageKeep($gurl,$rfurl,$filename,$gcookie,$JumpCount); } else { return FALSE; } } if(!preg_match(“/^2/”, $m_httphead["http-state"])) { return FALSE; } if(!isset($m_httphead)) { return FALSE; } $contentLength = $m_httphead['content-length']; //保存图片 $fp = fopen($filename,”w”) or die(“写入文件：{$filename} 失败！”); $i=0; $okdata = “”; $starttime = time(); while(!feof($m_fp)) { $okdata .= fgetc($m_fp); $i++; //超时退出 if(time()-$starttime>$maxtime)

{

break;

}

//到达指定大小结束

if($i >= $contentLength)

{

break;

}

}

if($okdata!=”")

{

fwrite($fp,$okdata);

}

fclose($fp);

if($okdata==”")

{

@unlink($filename);

fclose($m_fp);

return FALSE;

}

fclose($m_fp);

return TRUE;

}

//获得网址的host和query部份

function GetHostInfo($gurl)

{

$gurl = preg_replace(“/^http:///i”, “”, trim($gurl));

$garr['host'] = preg_replace(“//(.*)$/i”, “”, $gurl);

$garr['query'] = “/”.preg_replace(“/^([^/]*)//i”, “”, $gurl);

return $garr;

}

//获得页面返回的Cookie信息

function RefurlCookie($gurl)

{

global $gcookie,$lastRfurl;

$gurl = trim($gurl);

if(!empty($gcookie) && $lastRfurl==$gurl)

{

return $gcookie;

}

else

{

$lastRfurl=$gurl;

}

if(trim($gurl)==”)

{

return ”;

}

$urlinfos = GetHostInfo($gurl);

$ghost = $urlinfos['host'];

$gquery = $urlinfos['query'];

$sessionQuery = “GET $gquery HTTP/1.1rn”;

$sessionQuery .= “Host: $ghostrn”;

$sessionQuery .= “Accept: */*rn”;

$sessionQuery .= “User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)rn”;

$sessionQuery .= “Connection: Closernrn”;

$errno = “”;

$errstr = “”;

$m_fp = fsockopen($ghost, 80, $errno, $errstr,10) or die($ghost.’

‘);

fwrite($m_fp,$sessionQuery);

$lnum = 0;

//获取详细应答头

$gcookie = “”;

while(!feof($m_fp))

{

$line = trim(fgets($m_fp,256));

if($line == “” || $lnum>100)

{

break;

}

else

{

if(preg_match(“/^cookie/i”, $line))

{

$gcookie = $line;

break;

}

}

}

fclose($m_fp);

return $gcookie;

}