PHP export csv file function (enhanced version)

/**
 * Output CSV header information
 * Note: There should be no data output before and after using this function
 * @param $data Array Downloaded data
 * @param $file_name String Downloaded file name
 * @edit: bbs. it-home.org
*/
function outputCsvHeader($data,$file_name = 'export')
{
 header('Content-Type: text/csv ');
 $str = mb_convert_encoding($file_name, 'gbk', 'utf-8');
 header('Content-Disposition: attachment;filename="' .$str . '.csv"');
 header ('Cache-Control:must-revalidate,post-check=0,pre-check=0');
 header('Expires:0');
 header('Pragma:public');
 $csv_data = '' ;
 foreach ($data as $line)
 {
 foreach ($line as $key => &$item)
 {
 $item = str_replace (',',',',str_replace(PHP_EOL,'', $item)); //Filter (,) commas and line breaks in the generated csv file
 $item = mb_convert_encoding($item, 'gbk', 'utf-8');
 }
 $csv_data .= implode(', ', $line) . PHP_EOL;
 }
 echo $csv_data;
}
//Example of php exporting csv file
outputCsvHeader($data,"myfile.csv");