PHP download file function instance code _ php instance

This article introduces the function-related knowledge of php File Download through the instance code. The introduction is very detailed and has reference value. If you are interested, learn it together. PHP code for downloading objects using functions

Function download ($ url, $ filename) {// obtain the file size. To prevent files larger than 2 GB, use sprintf to read $ filesize = sprintf ("% u ", filesize ($ url); if (! $ Filesize) {return;} header ("Content-type: application/octet-stream \ n"); // application/octet-stream header ("Content-type: unknown/unknown; "); header (" Content-disposition: attachment; filename = \"". $ filename. "\" "); header ('content-transfer-encoding: binary '); if ($ range = getenv ('HTTP _ range ')) {// when there is an offset, use the 206 resumable upload header $ range = explode ('=', $ range); $ range = $ range [1]; header ("HTTP/1.1 206 Partial Content"); header ("Date :". gmdate ("D, d m y h: I: s "). "GMT"); header ("Last-Modified :". gmdate ("D, d m y h: I: s", filemtime ($ url )). "GMT"); header ("Accept-Ranges: bytes"); header ("Content-Length :". ($ filesize-$ range); header ("Content-Range: bytes ". $ range. ($ filesize-1 ). "/". $ filesize); header ("Connection: close ". "\ n"); else {Header ("Content-Length :". $ filesize. "\ n"); $ range = 0;} loadFile ($ url);} function loadFile ($ filename, $ retbytes = true) {$ buffer = ''; $ cnt = 0; $ handle = fopen ($ filename, 'rb'); if ($ handle = false) {return false;} while (! Feof ($ handle) {$ buffer = fread ($ handle, 1024*1024); echo $ buffer; ob_flush (); flush (); if ($ retbytes) {$ cnt + = strlen ($ buffer) ;}}$ status = fclose ($ handle); if ($ retbytes & $ status) {return $ cnt; // return num. bytes delivered like readfile () does .} return $ status ;}

Enter two parameters to download ($ url, $ filename)

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