php 下载文件的函数,
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 $status;<br />}<br />输入2个参数即可完成下载
download($url, $filename)
Déclaration:Le contenu de cet article est volontairement contribué par les internautes et les droits d'auteur appartiennent à l'auteur original. Ce site n'assume aucune responsabilité légale correspondante. Si vous trouvez un contenu suspecté de plagiat ou de contrefaçon, veuillez contacter admin@php.cn