Could not download CSV file on browser using PHP and MySQL - php

Question

I need to download the mysql record to csv file on browser but as per my code it's not working as expected. Here is my code:
$scope.downloadAllCustomerData=function(){
var url2='../service/admin/customer/customer.php?action=downloadAllCustomerData';
var method='GET';
var data1='';
DataService.connectToServerSideScript(method,url2,data1)
.then(function(response) {
console.log('response',response);
},function(error) {
})
}
Here is my client side code which making request to sevre to download the .CSV file.
if ($_REQUEST["action"]=="downloadAllCustomerData") {
header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename=data.csv');
$output = fopen("php://output", "w");
fputcsv($output, array('ID', 'Name', 'Email', 'MObile No'));
$sql = "SELECT user_id,name,email,mobile from cb_customer_info ORDER BY user_id DESC";
$stmt = $db->prepare($sql);
if ($stmt->execute()) {
$row = $stmt->fetchAll();
$number_of_rows= count($row);
if ($number_of_rows > 0) {
fputcsv($output, $row);
$data=array("status"=>1,"msg"=>"Downloaded all data successfully.");
}else{
$data=array("status"=>0,"msg"=>"No record found.");
}
fclose($output);
}
echo json_encode($data);
}
Here I am trying to download the mysql record into .csv file. I need when user will click on the button those record will be downloaded on the browser.

Answer 1

Better to form data and echo/print to browser instead of using php://output stream.
Usual headers for Download,
header("Content-Disposition: attachment;filename=\"".$file_name."\"");
header('Content-Type: '.$content_type);
header("Accept-Ranges: bytes");
header("Pragma: private");
header("Expires: -1");
header("Cache-Control: private, must-revalidate, post-check=0, pre-check=0");
header("Content-Length: ".$filesize);