本文实例讲述了php readfile下载大文件失败的解决方法。分享给大家供大家参考,具体如下:
大文件有200多M,只下载了200K就提示下载完成,且不报错。
原因是PHP内存有限制,需要改为按块下载,就是把大文件切块后逐块下载。
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if ( file_exists ( $file ))
{
if (FALSE!== ( $handler = fopen ( $file , 'r' )))
{
header( 'Content-Description: File Transfer' );
header( 'Content-Type: application/octet-stream' );
header( 'Content-Disposition: attachment; filename=' . basename ( $file ));
header( 'Content-Transfer-Encoding: chunked' ); //changed to chunked
header( 'Expires: 0' );
header( 'Cache-Control: must-revalidate, post-check=0, pre-check=0' );
header( 'Pragma: public' );
//header('Content-Length: ' . filesize($file)); //Remove
//Send the content in chunks
while (false !== ( $chunk = fread ( $handler ,4096)))
{
echo $chunk ;
}
}
exit ;
}
echo "<h1>Content error</h1><p>The file does not exist!</p>" ;
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希望本文所述对大家PHP程序设计有所帮助。