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PHP文件下载原理,
1、php下载原理图
2、文件下载源码:
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$file_name = "哈哈.jpg" ;
$file_name =iconv( "utf-8" , "gb2312" , "$file_name" );
$fp = fopen ( $file_name , "r+" );
if (! file_exists ( $file_name )){
echo "文件不存在" ;
exit ();
}
$file_size = filesize ( "a.jpg" );
Header( "Content-type: application/octet-stream" );
Header( "Accept-Ranges: bytes" );
Header( "Accept-Length: " . $file_size );
Header( "Content-Disposition: attachment; filename=" . $file_name );
$buffer =1024;
while (! feof ( $fp )){
$file_data = fread ( $fp , $buffer );
echo $file_data ;
}
fclose( $fp );
?>
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3、文件编码问题解决方法:
如果文件名是中文,php的函数不能识别中文文件名,一般如果程序编码为utf-8,php的函数比较古老,只能识别gb2312编码的中文,所以把中文用iconv(“原编码”,”要转成的编码”,”要转码的字符串”)函数可以转码。
比如,把一个字符串从utf-8转码为gb2312
$file_name=iconv(“utf-8”,”gb2312”,”$file_name”);
http://www.bkjia.com/PHPjc/969882.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/969882.htmlTechArticlePHP文件下载原理, 1、php下载原理图 2、文件下载源码: 1234567891011121314151617181920212223242526 ?php $file_name = "哈哈.jpg" ; //需要下载的文件 $file...