ob start - PHP multiple ob_start() and ob_end_clean() function not work -

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i have index page :

<?php ob_start(); session_name('d12tyu'); @session_start(); ob_end_clean(); require abspath .'/config.php'; require abspath . '/class/backup.php'; ?> <!doctype html> <html> ....... html+<?php ?> code </html>

in backup class have code download backup file :

    class db_backup     {     //other code      public function download($file)     {     ob_start();     $filename = $this->dir . $file;     $fp = fopen($filename, "rb");     header("pragma: public");     header("expires: 0");     header("cache-control: must-revalidate, post-check=0, pre-check=0");     header("cache-control: public");     header("content-description: file transfer");     header("content-type: application/octet-stream");     header("content-length: " . filesize($filename));     header("content-disposition: attachment;filename = " . $file . "");     ob_end_clean();     die(fpassthru($fp));     fclose($fp);     }      //other code     }

now, when click in link(?action=options&mod=backup&do=download&id=db-backup.zip) download file see this:

enter image description here

i cant download backup files. think problem ob_start(); , ob_end_clean();. how can fix problem ?!


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