CSV file is not getting downloaded after processing ?

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PHP

CSV

Hi,
I need to generate a CSV file from php and mysql for data between the two dates.
here is my code:

From date: <input type="text" id="fromdate" value="" onChange="showuser()">   To date: <input type="text" id="todate" value="" onChange="showuser()">  <input type="button" id="btn_bet_date" value="Export in excel">

Ajax:

<script type="text/javascript">
     $(function() {
                    $("#btn_bet_date").click(function() {
                        var fromdate = $("#fromdate").val();
    					 var todate = $("#todate").val();
                        $.post('bet_date_excel.php', { fromdate: fromdate,todate:todate });
                        return false;
                    });
                });
    </script>

bet_date_excel.php:

<?php
    error_reporting(0);
      include("database.php");
     
    
    	$fromdate= $_GET['fromdate'];
    	$todate = $_GET['todate'];
    //First we'll generate an output variable called out. It'll have all of our text for the CSV file.
    $out = '';
    
     $csv_hdr .= "\n\n\n Id,Date,Time,Movie,Name,Email,Phone,Approved";
     
     $out .= $csv_hdr;
     
     $result1 = mysql_query("SELECT * from bookings where date between '$fromdate' and '$todate'");
     
     while($row = mysql_fetch_array($result1))
    			{
    				 $id= $row["id"];
    				 $date= $row["date"];
    				 $time= $row["time"];
    				 $movie= $row["movie"];
    			     $name= $row["name"];
    				 $email= $row["email"];
    				 $phone= $row["phone"];
    				 $approved= $row["approved"];
    			}
    			 $csv_output .= $id .", ".$date.", ".$time.", ".$movie.", ".$name.", ".$email.", ".$phone.", ".$approved;
    			 
    $filename = "FirstLook-$fromdate-$todate";
    
    //Generate the CSV file header
    
    header("Content-type: application/vnd.ms-excel");
    header("Content-disposition: csv" . date("Y-m-d") . ".csv");
    header("Content-disposition: filename=".$filename.".csv");
    
    //Print the contents of out to the generated file.
    echo "\n                                                               "." Report of FirstLook Preview"; 
    
    print $out;

?>

I have used chrome's webtool also in which in network tab this php file is getting called is showing.

anyone have idea about it?