通过函数完成下载文件的php功能代码
function download($url, $filename) { // 获得文件大小, 防止超过2g的文件, 用sprintf来读 $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' )) { // 当有偏移量的时候，采用206的断点续传头 $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\n ); else { header ( content-length: . $filesize . \n\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 $status;}
输入2个参数即可完成下载 download($url, $filename)
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