通过函数完成下载文件的PHP功能代码<br><br>function download($url, $filename) {<br> // 获得文件大小, 防止超过2G的文件, 用sprintf来读<br> $filesize = sprintf ( "%u", filesize ( $url ) );<br> if (! $filesize) {<br> return;<br> }<br> header ( "Content-type:application/octet-stream\n" ); //application/octet-stream<br> header ( "Content-type:unknown/unknown;" );<br> header ( "Content-disposition: attachment; filename=\"" . $filename . "\"" );<br> header ( 'Content-transfer-encoding: binary' );<br> if ($range = getenv ( 'HTTP_RANGE' )) { // 当有偏移量的时候，采用206的断点续传头<br> $range = explode ( '=', $range );<br> $range = $range [1];<br><br> header ( "HTTP/1.1 206 Partial Content" );<br> header ( "Date: " . gmdate ( "D, d M Y H:i:s" ) . " GMT" );<br> header ( "Last-Modified: " . gmdate ( "D, d M Y H:i:s", filemtime ( $url ) ) . " GMT" );<br> header ( "Accept-Ranges: bytes" );<br> header ( "Content-Length:" . ($filesize - $range) );<br> header ( "Content-Range: bytes " . $range . ($filesize - 1) . "/" . $filesize );<br> header ( "Connection: close" . "\n\n" );<br> } else {<br> header ( "Content-Length:" . $filesize . "\n\n" );<br> $range = 0;<br> }<br> loadFile ( $url );<br>}<br><br>function loadFile($filename, $retbytes = true) {<br> $buffer = '';<br> $cnt = 0;<br> $handle = fopen ( $filename, 'rb' );<br> if ($handle === false) {<br> return false;<br> }<br> while ( ! feof ( $handle ) ) {<br> $buffer = fread ( $handle, 1024 * 1024 );<br> echo $buffer;<br> ob_flush ();<br> flush ();<br> if ($retbytes) {<br> $cnt += strlen ( $buffer );<br> }<br> }<br> $status = fclose ( $handle );<br> if ($retbytes && $status) {<br> return $cnt; // return num. bytes delivered like readfile() does.<br> }<br> return $status;<br>}<br>输入2个参数即可完成下载登入後複製
download($url, $filename)
登入後複製
