fputcsv inserting empty row in beginning of .csv

问题

<?php

$filename="backup_".date('m/d/Y', time()).".csv";

header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment;filename="'.$filename.'"');
header('Cache-Control: max-age=0');

$q=mysqli_query($conn,"SELECT * FROM visitordb");
$file = fopen('php://output','w');
if(mysqli_num_rows($q)>0) {
    while($res = $q->fetch_assoc()) {
        $datas = $res["sno"].','.$res["UDID"].','.$res["taggnumber"].','.$res["name"].','.$res["designation"].','.$res["company"].','.$res["email"];
        fputcsv($file, explode(',', $datas));
    }
} else {

}

fclose($file);
}

The above code generates empty line in the beginning of .csv file when viewed in ms excel. One more thing the .csv file also generates any html code in the page.

回答1:

what happens if you remove the header directives? You must know that headers are by definition concluded by a new line. I could imagine that this is a \n vs \r\n conflict.

If everything fails, get the whole output into buffer and trim it later:

ob_start();
...your code...
$out = ob_get_contents();
ob_end_clean();
echo trim($out);

Best regards

Zsolt

来源：https://stackoverflow.com/questions/16610821/fputcsv-inserting-empty-row-in-beginning-of-csv