如何使用PHP将查询字符串修改为普通URL？

I have following html form :

<div class="row form">
    <div class="col-md-offset-3 col-md-6 col-md-offset-3">
    <form class="form-inline" role="form" method="get" action="<?php echo htmlspecialchars(SITE_URL.'location'); ?>">
        <div class="form-group col-md-10 no-p-m">                      
            <select class="form-control" id="basic" name="location" required>
            <?php
            $get_location = mysqli_query($conn, "SELECT * FROM product_sub_area");
            if(mysqli_num_rows($get_location) == 0 ) {
                $choose = 'No City found';
            } else {
                $choose = 'Choose City';
            }
            ?>
            <option value=""><?php echo $choose; ?></option>
            <?php                                         
            while($get_location_result = mysqli_fetch_array($get_location) ) {
                $location_id = (int) $get_location_result['psub_area_id'];
                $location_name = htmlspecialchars($get_location_result['psub_name']);
                echo "<option value='$location_id'>$location_name</option>";
            }
            ?>                    
            </select>
        </div>
        <div class="form-group col-md-2 no-p-m" id="basic">  
            <input type="submit" class="btn btn-default filter-search" value="BROWSE">
        </div> 
    </form>                
    </div>
</div>  

When I submit this form the url is showing like bellow :

http://localhost/freelancer/happiechef/location?location=1

But I need to show this type of url :

http://localhost/freelancer/happiechef/location/carlifonia

here /location/ is a page called location.php. I am hiding page extension using .htaccess.

So from location.php page I want to get $_GET['location'] value = $location_id

for eg.

$_GET['location'] = 1 or 2 ( select tag option value)

Existing .htaccess code

ErrorDocument 404 not-found.php
RewriteEngine On        

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^location/([\w-]+)$ location.php?location=$1 [QSA,NC,L]

RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*)$ $1.php [NC,L]

Here is an example of how this can be accomplished in jQuery:

First, add an id to your <form> tag so you can access it easily:

<form id="formname" class="form-inline" role="form" method="get" action="<?php echo htmlspecialchars(SITE_URL.'location'); ?>">

You also have a duplicate id called "basic". Make sure you leave it only on the <select> tag and remove the other one.

Then in your JS:

$("#formname").submit(function(event) {
    event.preventDefault();
    var loc = $("#basic option:selected").text();
    window.location.href = '/freelancer/happiechef/location/' + loc;
});

This will forward the user to the URL, for example http://localhost/freelancer/happiechef/location/carlifonia. Then .htaccess will rewrite this URL to location.php?location=california.