Echoing to screen when using headers to output to csv - php

Question

I have a PHP application which generates a set of codes , saves them to MySQL DB and then outputs the same to the user as a downloadable csv file. I also have an echo statement after the code block to convert the PHP array to csv. The echo statement after the convert_to_csv function call instead of outputting to the browser outputs to the file instead and overwrites the first line. How do I get the echo statement to output to the browser instead? The code block is below:
convert_to_csv($newCodesArray,$fileName,',');
echo "Your file was successfully generated";
function convert_to_csv($input_array, $fileName, $delimiter)
{
header('Content-Type: text/csv');
header("Content-Disposition: attachment; filename=\"$fileName\"");
$f = fopen('php://output', 'w');
/* loop through array */
foreach ($input_array as $line) {
/* default php csv handler */
fputcsv($f, $line, $delimiter);
}
fclose($f) or die("Can't close php://output");
}

Answer 1

You have already defined the header as text/csv. So it wont print in the browser as it requires text/html.
Alternatively you can do as following. Copy your function to different file (Ex. csv.php).
<?php
echo "Your file was successfully generated <script> window.location = 'csv.php' </script>";
Now it will print your echo string and start download your csv file.
As Magnus Eriksson commented,
Above code does not checking its really generated successfully or not. We can extend code with AJAX.
<script>
$.ajax('csv.php', {
success: function(data) {
document.write('Your file was successfully generated.');
windows.location = 'csv.php';
},
error: function() {
document.write('Your file generation failed.');
}
});
</script>
Note:- AJAX call will generate file two times.