PHP Extra Large File download, breakpoint continued download

Source:

<?php $sourceFile="1.tmp";The temporary file name to download $outFile="User order. xls";Download the file name saved to the client $file _extension= Strtolower (substr (STRRCHR ($sourceFile,"."),1));Get file name extensionEcho $sourceFile;if (!ereg ("[Tmp|txt|rar|pdf|doc]", $file _extension)) exit ("Illegal resources download");Detects if a file existsif (!is_file ($sourceFile)) {Die ("<b>404 File not found!</b>"); } $len= FileSize ($sourceFile);Gets the file size $filename= BaseName ($sourceFile);Get the file name $outFile _extension= Strtolower (substr (STRRCHR ($outFile,"."),1));Get file name extensionIndicates the output browser format according to the extensionSwitch ($outFile _extension) {Case"EXE": $ctype="Application/octet-stream";BreakCase"Zip": $ctype="Application/zip";BreakCase"MP3": $ctype="Audio/mpeg";BreakCase"MPG": $ctype="Video/mpeg";BreakCase"Avi": $ctype="Video/x-msvideo";BreakDefault: $ctype="Application/force-download"; }Begin Writing Headers Header ("Cache-control:"); Header"Cache-control:public");Sets the output browser format header ("Content-type: $ctype"); Header"Content-disposition:attachment; Filename= ". $outFile); Header"Accept-ranges:bytes"); $size= FileSize ($sourceFile);If there is a $_server[' http_range ' parameterif (Isset ($_server[' Http_range ')) {The/*range header field Range header field can request one or more child ranges of an entity. For example, represents the first 500 bytes: bytes=0-499 represents the second 500 bytes: bytes=500-999 represents the last 500 bytes: bytes=-500 represents the range after 500 bytes: bytes=500-First and last byte: bytes= 0-0,-1 specifies several ranges: bytes=500-600,601-999 but the server can ignore this request header, and if the unconditional get contains a range request header, the response is returned as a status code of 206 (partialcontent) instead of a (OK). */The value of $_server[' Http_range '] is connected again after the breakpoint bytes=4390912-list ($a, $range)= Explode ("=", $_server[' Http_range ']);If yes, download missing part str_replace ($range,"-", $range);What does that say? $size 2= $size-1;Total number of files bytes $new _length= $size 2-$range;Gets the length of the next download header ("http/1.1 206 Partial Content"); Header"Content-length: $new _length");Enter the total length header ("Content-range:bytes $range $size2/$size");Content-range:bytes 4908618-4988927/4988928 95%}else { //first-time connection $size 2 = $size1; Header ("Content-range:bytes 0-$size 2/$size"); //content-range:bytes 0-4988927/4988928 Header ("Content-length:". $size); //Output total length} //Open file $fp = fopen ("$sourceFile", "RB"); //Set pointer position fseek ($FP, $range); //Unreal output while (!feof ($fp)) { //Set file Maximum execution time Set_time_limit (0); print (Fread ($fp, 1024x768 * 8)); c20>//output file flush (); //Output buffer Ob_flush ();} Fclose ($FP); Exit ();  

PHP Extra Large File download, breakpoint continued download