Zipping file and downloading it with php -

i have written script add files zip archive , download on form submission.

file path determined according submitted data. first, file paths determined , checked existence , added array.

then files added zipped archive , downloaded. following code. takes time. increased maximum execution time 120 seconds still doesn't work.

if (isset($valid_files)) {     if(count($valid_files)) {         $zip = new ziparchive();         $zip_name = "file_name.zip";         $zip_path = "files/$zip_name";         $opened = $zip->open( $zip_path, ziparchive::create | ziparchive::overwrite );         if( $opened !== true ){             die("cannot open {$zip_name} writing.");         }         foreach($valid_files $key => $file) {             $f_name = $key.ext";             $zip->addfile($file,$f_name);         }         $zip->close();         if (file_exists($zip_path)) {             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/zip" );             header( "content-disposition: attachment; filename=\"" . $zip_name . "\"" );             header( "content-transfer-encoding: binary" );             header( "content-length: " . filesize( $zip_path ) );             readfile($zip_path);             die;         }     } }