fputcsv doesn't write any data in a CSV file
===

In my web site I'm creating a table from the mysql data and then now I want to add a export button buttom of the table so that a user will be able to download the data as an CSV file.

To do that I wrote dummy form:

	<form action="<?=$_SERVER['PHP_SELF'];?>" method="post">
		<input type="submit" name="submit" value="Click Me">
	</form>

And at the top of the php file I have:

	if(isset($_POST['submit'])) {
		export();
	}

In my export function I have some mysql stuff, I'm creating an array and pushing data into it, and then:

    $header = array('name', 'date', 'total', 'success', 'opens', 'clicks', 'success_rate', 'open_rate', 'CTO', 'CTR')
    $fp = fopen('exportme2.csv', 'w');
    fputcsv($fp, $header);
    
    foreach ($data as $lines) {
    	    fputcsv($fp, $lines);
    }
    fclose($fp);

After I click to export button, I'll have exportme2.csv file, however it is empty !
The data may be wrong so that there won't be anything but at least I should have the header names.

Can you help me about this issue please ?

Thanks.