PHP remote file download class (supports resumable data transfer) _ PHP Tutorial

PHP remote file download class (supports resumable upload ). PHP remote file download class, supports resumable download, the code contains specific call instructions. The program uses the HTTP protocol to download files. the HTTP1.1 protocol must specify the PHP remote file download class after the document ends. resumable download is supported. the code contains specific call instructions. The program uses the HTTP protocol to download files. the HTTP1.1 protocol must specify that the link is closed after the document ends. otherwise, feof cannot be used to judge the end of the document. you can use either of the following methods, for details, download and view the source code.

 M_url = $ url; if (is_array ($ urls) {$ this-> m_host = $ urls ["host"]; if (! Empty ($ urls ["scheme"]) $ this-> m_scheme = $ urls ["scheme"]; if (! Empty ($ urls ["user"]) $ this-> m_user = $ urls ["user"]; if (! Empty ($ urls ["pass"]) $ this-> m_pass = $ urls ["pass"]; if (! Empty ($ urls ["port"]) $ this-> m_port = $ urls ["port"]; if (! Empty ($ urls ["path"]) $ this-> m_path = $ urls ["path"]; $ this-> m_urlpath = $ this-> m_path; if (! Empty ($ urls ["query"]) {$ this-> m_query = $ urls ["query"]; $ this-> m_urlpath. = "? ". $ This-> m_query ;}}/ *** open the specified url */function OpenUrl ($ url) {# reset the parameters $ this-> m_url = ""; $ this-> m_urlpath = ""; $ this-> m_scheme = "http"; $ this-> m_host = ""; $ this-> m_port = "80 "; $ this-> m_user = ""; $ this-> m_pass = ""; $ this-> m_path = "/"; $ this-> m_query = ""; $ this-> m_error = ""; $ this-> m_httphead = ""; $ this-> m_html = ""; $ this-> Close (); # Initialize the system $ this-> PrivateInit ($ url); $ this-> PrivateStartSession ();}/*** get the cause of an operation error */public function printError () {echo "error message :". $ this-> m_error; echo "specific return headers:
"; Foreach ($ this-> m_httphead as $ k = >$ v) {echo" $ k => $ v
Rn ";}}/*** determine whether the response result of the header sent by the Get method is correct */public function IsGetOK () {if (ereg (" ^ 2 ", $ this-> GetHead ("http-state") {return true;} else {$ this-> m_error. = $ this-> GetHead ("http-state "). "-". $ this-> GetHead ("http-describe ")."
"; Return false ;}}/*** check whether the returned webpage is of the text type */public function IsText () {if (ereg (" ^ 2 ", $ this-> GetHead ("http-state") & eregi ("^ text", $ this-> GetHead ("content-type "))) {return true;} else {$ this-> m_error. = "The content is non-text
"; Return false ;}}/*** determine whether the returned webpage is of a specific type */public function IsContentType ($ ctype) {if (ereg (" ^ 2 ", $ this-> GetHead ("http-state") & $ this-> GetHead ("content-type") = strtolower ($ ctype) {return true ;} else {$ this-> m_error. = "wrong type ". $ this-> GetHead ("content-type ")."
"; Return false ;}}/*** download an object using HTTP */public function SaveToBin ($ savefilename) {if (! $ This-> IsGetOK () return false; if (@ feof ($ this-> m_fp) {$ this-> m_error = "The connection has been closed! "; Return false;} $ fp = fopen ($ savefilename," w ") or die (" An error occurred while writing $ savefilename to the file! "); While (! Feof ($ this-> m_fp) {@ fwrite ($ fp, fgets ($ this-> m_fp, 256) ;}@ fclose ($ this-> m_fp ); return true;}/*** save the webpage content as a Text file */public function SaveToText ($ savefilename) {if ($ this-> IsText ()) {$ this-> SaveBinFile ($ savefilename);} else {return "" ;}}/*** obtain the content of a webpage through HTTP */public function GetHtml () {if (! $ This-> IsText () return ""; if ($ this-> m_html! = "") Return $ this-> m_html; if (! $ This-> m_fp | @ feof ($ this-> m_fp) return ""; while (! Feof ($ this-> m_fp) {$ this-> m_html. = fgets ($ this-> m_fp, 256) ;}@ fclose ($ this-> m_fp); return $ this-> m_html ;} /*** start HTTP session */public function PrivateStartSession () {if (! $ This-> PrivateOpenHost () {$ this-> m_error. = "an error occurred while enabling the remote host! "; Return false;} if ($ this-> GetHead (" http-edition ") =" HTTP/1.1 ") {$ httpv =" HTTP/1.1 ";} else {$ httpv = "HTTP/1.0";} fputs ($ this-> m_fp, "GET ". $ this-> m_urlpath. "$ httpvrn"); fputs ($ this-> m_fp, "Host :". $ this-> m_host. "rn"); fputs ($ this-> m_fp, "Accept: */* rn"); fputs ($ this-> m_fp, "User-Agent: mozilla/4.0 + (compatible; + MSIE + 6.0; + Windows + NT + 5.2) rn "); # the link must be closed after the document ends in HTTP1.1, otherwise, feof cannot be used to judge the end of the read. if ($ httpv = "HTTP/1.1") {fputs ($ this-> m_fp, "Connection: Closernrn ");} else {fputs ($ this-> m_fp, "rn") ;}$ httpstas = fgets ($ this-> m_fp, 256); $ httpstas = split ("", $ httpstas); $ this-> m_httphead ["http-edition"] = trim ($ httpstas [0]); $ this-> m_httphead ["http-state"] = trim ($ httpstas [1]); $ this-> m_httphead ["http-describe"] = ""; for ($ I = 2; $ I
 
  
M_httphead ["http-describe"]. = ". trim ($ httpstas [$ I]);} while (! Feof ($ this-> m_fp) {$ line = str_replace ("", "", trim (fgets ($ this-> m_fp, 256 ))); if ($ line = "") break; if (ereg (":", $ line) {$ lines = split (":", $ line ); $ this-> m_httphead [strtolower (trim ($ lines [0])] = trim ($ lines [1]) ;}} /*** get the value of an Http header */public function GetHead ($ headname) {$ headname = strtolower ($ headname ); if (isset ($ this-> m_httphead [$ headname]) {return $ this-> m_httphead [$ headname];} else {return "";}} /*** Open the connection */public function PrivateOpenHost () {if ($ this-> m_host = "") return false; $ this-> m_fp = @ fsockopen ($ this-> m_host, $ this-> m_port, & $ errno, & $ errstr, 10); if (! $ This-> m_fp) {$ this-> m_error = $ errstr; return false;} else {return true ;}/ *** Close connection */public function Close () {@ fclose ($ this-> m_fp) ;}# use the following methods: # Open the webpage $ httpdown = new HttpDownload (); $ httpdown-> OpenUrl (" http://www.google.com.hk "); Echo $ httpdown-> GetHtml (); $ httpdown-> Close (); # download the file $ file = new HttpDownload (); # instantiation class $ file-> OpenUrl (" http://www.ti.com.cn/cn/lit/an/rust020/rust020.pdf "); # Remote file address $ file-> SaveToBin (" rust020133 "); # save path and file name $ file-> Close (); # release resources?>
 

Http://www.bkjia.com/PHPjc/371737.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/371737.htmlTechArticlePHP download remote file class, supports resumable download, the code contains the specific call description. The program uses the HTTP protocol to download files. the HTTP1.1 protocol must specify the end of the document...