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
-
-
- 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;
-
- }
-
- 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: *
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- *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;
-
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- $gcookie = “”;
- while(!feof($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;
- }
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