PHP 下載遠程網頁圖片並且儲存在本地執行個體

fopen函數執行個體

ob_start : 開啟輸出緩衝

readfile : 讀入一個檔案並寫入到輸出緩衝
返回從檔案中讀入的位元組數。如果出錯返回 FALSE 並且除非是以 @readfile() 形式調用，否則會顯示錯誤資訊。

ob_get_contents : Return the contents of the output buffer(返回輸出緩衝的內容)
This will return the contents of the output buffer without clearing it or FALSE, if output buffering isn’t active. (如果輸出緩衝沒有活動（開啟），則返回 FALSE)

ob_end_clean() : Clean (erase) the output buffer and turn off output buffering(清除輸出緩衝)

代碼如下

複製代碼

<?php //URL是遠端完整圖片地址，不可為空, $filename 是另存新檔的圖片名字 //預設把圖片放在以此指令碼相同的目錄裡 function GrabImage($url,$filename=""){         if($url == ""){             return false;         }                 $ext=strrchr($url,".");                 if($ext != ".gif" && $ext != ".jpg" && $ext != ".bmp" && $ext != ".png"){             echo "格式不支援！";             return false;         }                 if($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 "不能寫入檔案".$filename;             exit();         }else{             echo "儲存圖片成功！";         }         fclose($fp2);         return $filename;             } //測試 GrabImage("/logo.png","as.png"); ?>

php下載遠程圖片函數 可偽造來路

$gurl 要下載的圖片地址
$rfurl 來路。如果靶心圖表像做了防盜鏈設定，可以繞過。
$filename 下載圖片儲存的檔案名稱，相對路徑，不要用realpath
$gcookie 調整cookie 偽造的cookie
$JumpCount 跳轉計數
$maxtime 最大次數
調用方法：DownImageKeep(“yun_qi_img/baidu_jgylogo2.gif”,”http://baidu.com”,”a.gif”,”",0,10);

代碼如下

複製代碼

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==”" && !empty($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; //擷取應答頭 $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']; //儲存圖片 $fp = fopen($filename,”w”) or die(“寫入檔案：{$filename} 失敗！”); $i=0; $okdata = “”; $starttime = time(); while(!feof($m_fp)) { $okdata .= fgetc($m_fp); $i++; //逾時退出 if(time()-$starttime>$maxtime) { break; } //到達指定大小結束 if($i >= $contentLength) { break; } } if($okdata!=”") { fwrite($fp,$okdata); } fclose($fp); if($okdata==”") { @unlink($filename); fclose($m_fp); return FALSE; } fclose($m_fp); return TRUE; } //獲得網址的host和query部份 function GetHostInfo($gurl) { $gurl = preg_replace(“/^http:///i”, “”, trim($gurl)); $garr['host'] = preg_replace(“//(.*)$/i”, “”, $gurl); $garr['query'] = “/”.preg_replace(“/^([^/]*)//i”, “”, $gurl); return $garr; } //獲得頁面返回的Cookie資訊 function RefurlCookie($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; //擷取詳細應答頭 $gcookie = “”; while(!feof($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; }