i have a php script that generates a text file. the code is as follows. the text file is being is being created.

<?php
    session_start();
    /**
    * @author FreeUser
    * @copyright 2013
    */

    set_time_limit(0); // override the maximum execution time in php.ini file
    require_once 'includes/mysql_connect.php';
    require_once 'includes/functions.php';

    if ( isset( $_POST['btnProcess'] ) ) {
        $errors = array();

        if ( $_POST['txtStartDate'] == "" ) {
            $errors[] = 'Select the start date.';
        } else {
            $startDate = $_POST['txtStartDate'];
        }

        if ( $_POST['txtEndDate'] == "" ) {
            $errors[] = 'Select the end date.';
        } else {
            $endDate = $_POST['txtEndDate'];
        }

        if ( $_POST['authorityID'] == "" ) {
            $errors[] = 'Select the paying authority.';
        } else {
            $authorityID = (int)$_POST['authorityID'];
        }

        if ( empty( $errors ) ) {
            $sql = "SELECT policyNumber, ECNumber, totalContribution as premium FROM policydetails WHERE authorityID = {$authorityID} ";
            $sql .= "AND ( dateCreated >= '$startDate' AND dateCreated <= '{$endDate}' )";
            // $sql .= "AND dateCaptured BETWEEN '$startDate' AND '{$endDate}'";
            $result = mysql_query( $sql );
            $authority = getAuthorityName( $authorityID ); 
            $authorityCode = getAuthorityCode( $authorityID );
            $file = 'files/' . strtolower( $authorityCode ) . time() . '.txt';
            $handle = fopen( $file, 'w' );
            if ( !$handle ) {
                $errors[] = 'Could not create file for writing.';
            }
            $len = strlen( $authority ); // assign the lenght of $authority to $len
            if ( $len > 30 ) {
                $authority = substr( $authority, 0, 30 );  
            } elseif ( $len < 30 ) {
                $authority = str_pad( $authority, 30, " ", STR_PAD_RIGHT ); // pad white space to the right of $authority
            }
            $startDate = str_replace("-", "", $startDate );
            $endDate = str_replace("-", "", $endDate );
            $currentDate = date( "Y-m-d" );
            $newDate = str_replace("-", "", $currentDate );
            $header = 'HDR' . $authority . $newDate . "\n"; // build the header for the fileh
            fwrite( $handle, $header ); // append the header to the file
            $count = 0; // initialize $count to 0
            $amount = 0; // initialize $amount to 0
            // echo $sql . '<br />';
            while( $row = mysql_fetch_array( $result ) ) {
                if ( strlen( $row['ECNumber'] ) > 8 ) {
                    $ECNumber = substr( $$row['ECNumber'], 0, 8 );
                } else {
                    $ECNumber = str_pad( $row['ECNumber'], 8, " ", STR_PAD_RIGHT );
                }
                $string = 'DED' . $ECNumber . 'N' . 8008 . 81115;
                if ( strlen( $row['policyNumber'] ) < 12 ) { // policyNumber is less than 12 characters long
                    $policy = str_pad( $row['policyNumber'], 12, " ", STR_PAD_RIGHT ); // pad white space to the right of $row['policyNumber'] and assign to $policyNumber
                }
                $string .= $policy . $startDate . $endDate;
                $premium = str_pad( ( $row['premium'] * 100 ), 12, "0", STR_PAD_LEFT );
                $string .= $premium . "\n";
                $count++; // increment $count by 1
                $amount = $amount + $row['premium']; // increase $amount by policy's totalContribution
                fwrite( $handle, $string ); // write the row's data to the file
                // echo $policy . "<br />";
            }
            $numberRecords = str_pad( $count, 6, "0", STR_PAD_LEFT );
            $totalAmount = str_pad( ( $amount * 100 ) , 18, "0", STR_PAD_LEFT );
            $trailer = 'TRL' . $numberRecords . $totalAmount; // build the string for the trailer
            fwrite( $handle, $trailer ); // write the trailer to the end of the file
            fclose( $handle ); // close the file
            header( "Location: $file" );
            exit;
        }
    }
?>
<html>
    <head>  
        <title>Process EDI Sending</title>
        <style> 
            .error {
                color: #FF0000;
                font-weight: bold;   
            }

            h2 {
                font-family: Arial, Helvetica, sans-serif;
                font-size: x-large;
                color: blue;
                font-weight: bold;
            }
            h3 {
                font-family: Arial, Helvetica, sans-serif;
                font-weight: normal;  
                font-size: 18px;  
            }

            li {
                list-style: none;
                padding-top:5px;   
            }
        </style>
        <script type="text/javascript" src="js/jquery-1.5.2.min.js"></script>
        <script type="text/javascript" src="js/jquery-1.8.3.js"></script>
        <script type="text/javascript" src="js/jquery-ui.js"></script>
        <link rel="stylesheet" type="text/css" media="screen" href="js/jquery-ui.css" />
        <script language="javascript">
            $(function() {
                $( ".datepicker" ).datepicker({
                    dateFormat : 'yy-mm-dd',
                    changeMonth : true,
                    changeYear : true,
                    yearRange: '-100y:c+nn',
                    maxDate: '1000d'
                });
            });
        </script>
        <link rel="stylesheet" href="css/style.css" type="text/css" media="screen" />

        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    </head>
    <body>
    <h2>Process EDI Sending</h2>
        <?php
            if ( !isset( $_SESSION['loggedUserID'] ) ) {
                header( 'Location: login.php');
                exit;    
            }

            if ( isset( $errors )  && is_array( $errors ) ) {
                // there are form submission errors, which must be displayed
                echo '<ul>';
                foreach ( $errors as $warning ) {
                    echo "<li class='error'>$warning</li>";
                }
                echo '</ul>';
            }
        ?>
        <form method="post" action="">
            <table>
                <tr>
                    <td><b>Paying Authority:</b></td>
                    <td>
                        <select name="authorityID">
                            <option value="">Select Paying Authority</option>
                            <?php
                                $sql = "SELECT authorityID, payingAuthorityName AS authority FROM tblpayingauthorities WHERE EDI = ";
                                $sql .= "'yes' ORDER BY authority ASC";
                                $result = mysql_query( $sql );
                                while( $row = mysql_fetch_array( $result ) ) {
                                  if ( isset( $_POST['authorityID'] ) && ( $_POST['authorityID'] == $row['authorityID'] ) ) {
                                    $selectedAuthority = ' Selected ';
                                  } else {
                                    $selectedAuthority = '';
                                  }
                                  ?>
                                    <option value="<?php  echo $row['authorityID']; ?>"<?php echo $selectedAuthority; ?> ><?php echo $row['authority']; ?></option>
                                  <?php
                                }
                            ?>
                        </select>
                    </td>
                    <td><b>Start Date:</b></td>
                    <td><input type="text" class="datepicker" name="txtStartDate" value="<?php if ( isset( $_POST['txtStartDate'] ) ) echo $_POST['txtStartDate']; ?>"/></td>
                </tr>
                <tr>
                    <td><b>End Date:</b></td>
                    <td><input type="text" class="datepicker" name="txtEndDate" value="<?php if ( isset( $_POST['txtEndDate'] ) ) echo $_POST['txtEndDate']; ?>"/></td>
                </tr>  
                <tr>
                    <td colspan="4" align="right">
                        <input type="submit" value="Process EDI Sending" name="btnProcess" />  <a href="index.php">«Back</a>
                    </td>
                </tr>  
            </table>
        </form>
    </body>
</html>

the problem i want to enable the user to be able to download the generated text file. what changes do i need to make to my code to achieve this

If the text file is publicly available, you could provide a direct download link to the user. Just turn the path into a valid URL.

how do i do that? want it to be downloaded just after the file has been processed

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