PHP downloads remote webpage images and saves them to a local instance

Fopen function instance

Ob_start: enable the output buffer.

Readfile: reads a file and writes it to the output buffer.
Returns the number of bytes read from the file. If an error is returned, FALSE is returned, and the error message is displayed unless called in the form of @ readfile.

Ob_get_contents: Return the contents of the output buffer (Return the content of the output buffer)
This will return the contents of the output buffer without clearing it or FALSE, if output buffering isn' t active. (if the output buffer has no activity (open), FALSE is returned)

Ob_end_clean (): Clean (erase) the output buffer and turn off output buffering (clear output buffer)

The code is as follows:

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<? Php // The URL is the complete remote image address and cannot be blank. $ filename is the name of the saved image. // By default, images are stored in the same directory as the script. Function GrabImage ($ url, $ filename = ""){ If ($ url = ""){ Return false;         }         $ Ext = strrchr ($ url ,".");         If ($ ext! = ". Gif" & $ ext! = ". Jpg" & $ ext! = ". Bmp" & $ ext! = ". Png "){ Echo "format not supported! "; Return false;         }         If ($ filename = ""){ $ Filename = time (). "$ ext ";         }         Ob_start (); Readfile ($ url ); $ Img = ob_get_contents (); Ob_end_clean (); $ Size = strlen ($ img ); $ Fp2 = fopen ($ filename, ""); If (fwrite ($ fp2, $ img) === false ){ Echo "file cannot be written". $ filename; Exit (); } Else { Echo "image saved! ";         } Fclose ($ fp2 ); Return $ filename;             } // Test GrabImage ("/logo.png", "as.png "); ?>

Php remote image download function can be forged

$ Gurl: The Image address to download
$ Rfurl. If the target image has anti-Leech settings, you can bypass it.
$ Filename: the file name for downloading the image, relative path. Do not use realpath.
$ Gcookie: adjust cookie forgery
$ JumpCount jump count
$ Maxtime maximum times
Call method: DownImageKeep ("yun_qi_img/baidu_jgylogo2.gif", "http://baidu.com examples, example A.gif );

The code is as follows:

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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; // Obtain the response header $ 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']; // save the image $ fp = fopen ($ filename, "w ") or die ("writing File: {$ filename} failed! "); $ I = 0; $ okdata = ""; $ starttime = time (); while (! Feof ($ m_fp) {$ okdata. = fgetc ($ m_fp); $ I ++; // time-out exit if (time ()-$ starttime> $ maxtime) { Break; } // End with the specified size 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; } // Obtain the host and query parts of the website Function GetHostInfo ($ gurl) { $ Gurl = preg_replace ("/^ http: // I", "", trim ($ gurl )); $ Garr ['host'] = preg_replace ("// (. *) $/I", "", $ gurl ); $ Garr ['query'] = "/". preg_replace ("/^ ([^/] *) // I", "", $ gurl ); Return $ garr; } // Obtain the Cookie information returned by the page 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; // Obtain the detailed response header $ 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; }