Excel import from mysql table - php

Question

<?php
require_once("db_connect.php");
$arr = $_GET['arr'];
$selected_header = implode(', ', (array)$arr);
$sql = "SELECT $selected_header FROM release_ ORDER BY id DESC";
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment; filename=CNC-'.date('Ymd').'.xls');
header('Pragma: no-cache');
header('Expires: 0');
$output = '';
$output .= '<table><tr>';
$header_arr = explode(',', $arr);
$len = count($header_arr);
for($a=0; $a<$len; $a++){
$output .= "<th style='width: 100px; text-align: center;'>" . $header_arr[$a] . "</th>";
}
$output .= '</tr>';
$res = mysqli_query($conn, $sql);
/*====this ruins everything=====*/
while($row = $res->fetch_assoc()){
$output = '<tr align="center">';
for($a=0; $a<$len; $a++){
$output .= "<td>" . $header_arr[$a] . "</td>";
}
echo "</tr>\t\n";
}
/*===============================*/
$output .= '</table>';
echo $output;
?>
I am able to get and display the header in the excel file but the content is not displaying at all. I get the whole string of row tag displayed. How am I able to display the data from the database to excel file. Please help.

Answer 1

I have done in my project(Cakephp) you can use like this own way :-
public function ExportToExcel(){
$users_id = $this->Session->read('selected_user_id');
$this->loadModel('User');
$conditions= array('User.usertype !='=>1);
if(!empty($users_id)){
$ids=explode(",",$users_id);
$conditions = array(
'User.id'=>$ids
);
}
$users = $this->User->find('all',array(
'conditions'=>$conditions,
'order'=>array('User.id Desc')
)
);
ini_set('max_execution_time', 600); //increase max_execution_time to 10 min if data set is very large
$filename = "Users" . date("Y.m.d") . ".xls";
header('Content-type: application/ms-excel');
header('Content-Disposition: attachment; filename="' . $filename . '"');
$i = 1;
$row="";
$row_header="S.No."."\t"."Name "."\t"."Email"."\t"."Mobile"."\t"."Address"."\t"."Status"."\n";
if(!empty($users)){
foreach($users as $user){
if($user['User']['status']==1){
$status = "Active";
}
else{
$status = "Inactive";
}
$row .= $i++."\t".$user['User']['firstname'].' '.$user['User']['lastname']
."\t".$user['User']['email']
."\t".$user['User']['phone_number']
."\t".$user['User']['address']
."\t".$status
."\n";
}
}
$this->Session->delete('selected_user_id');
echo($row_header);
echo($row);
die;
}