PHP导出到CSV文件的前两行为空

Question

I have the below data in an array and want to write to CSV file. Everything is working except i see first two empty lines in the .csv file

Any help is appreciated... Thanks again!!!!

Output in CSV file looks like empty Line1
empty Line2
ip address ip state description hostmane mac owner device notes data......

Array data:

Array (
[0] =>Array ( [ip address] => 1.3.2.1 [ip state] => Active [description] => [hostname] => [mac] => [owner] => [device] => [note] => ) 
[1] =>Array ( [ip address] => 1.3.2.2 [ip state] => Reserved [description] => [hostname] => linux [mac] => [owner] => test [device] => Linux Server [note] => Linux123 )
[2] => Array ( [ip address] => 1.3.2.3 [ip state] => Active [description] => [hostname] => [mac] => [owner] => [device] => [note] => )
[3] => Array ( [ip address] => 1.3.2.4 [ip state] => Active [description] => [hostname] => [mac] => [owner] => [device] => [note] => )
)  

PHP Function i am using to write to CSV file is:

switch("export-to-csv")
{   
    case "export-to-csv" :
        // Submission from
        $filename = $_GET["exformat"] . ".csv";
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Content-type: text/csv");
        header("Content-Disposition: attachment; filename=\"$filename\"");
        header("Expires: 0");
        ExportCSVFile($data);
        //$_GET["exformat"] = '';
        exit();
    default :
        die("Unknown action : ".$_POST["action"]);
        break;
}

function ExportCSVFile($records) {
    // create a file pointer connected to the output stream 
    #print_r ($records); return;
    $fh = fopen( 'php://output', 'w' );
    $heading = false;
    if(!empty($records)) {
        foreach($records as $row) {            
            if(!$heading)  {
              // output the column headings
              fputcsv($fh, array_keys($row));
              $heading = true;
            }
        // loop over the rows, outputting them
         fputcsv($fh, array_values($row));              
      }       

    }
}

Answer 1

Please any of the files like index.php of the framework or any other file having empty lines in the beginning, this can cause empty lines in the csv.