php 下载文件的函数，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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