deleting a sql dump file - php

Question

I create a csv file with the SQL query:
$sql = "SELECT 'id','username','name','email',
'phone_number','city',
'batch','course_type' UNION ALL
SELECT id, username, name, email,
phone_number, city, batch, course_type
FROM users INTO OUTFILE '".$file_path."' ".
"FIELDS TERMINATED BY ','
ENCLOSED BY '\"'
LINES TERMINATED BY '\n'";
After causing a browser force-download of this file, I need to delete this file from the /tmp directory. But since, the file is owned by mysql, the php code cannot delete it. How do I change permissions on this file in my code so that the file can be deleted?

Answer 1

One solution to do this right, is (This is a rough example of how it could be done):
Return the data from the database as an array, and iterate through it:
// tell the browser that this is a download
header("Content-type: text/csv");
header("Content-Disposition: attachment; filename=list.csv");
// column separator
$separator = ';';
// field delimiter
$field_delimiter = '"';
// line end
$line_end = "\r\n";
foreach ($result as $row):
$i = 0;
foreach ($row as $item):
// do not add separator before the first item
if ($i > 0)
{
echo $separator;
}
echo $field_delimiter.$item.$field_delimiter;
$i++;
endforeach;
// line end
echo $line_end;
endforeach;
Do not output anything else, just the CSV content.