How to store the checkbox array values in MYSQL through PHP?

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PHP

<div id="project_aminities" class="project_aminities">
         <label>Aminities:</label>
            <input type="checkbox" value="Gym" name="aminities[]">Gym
            <input type="checkbox" value="Indoor Games" name="aminities[]">Indoor Games
            <input type="checkbox" value="Children Play Area" name="aminities[]">Children Play Area
            <input type="checkbox" value="Swimming Pool" name="aminities[]">Swimming Pool
            <input type="checkbox" value="Multi Function Hall" name="aminities[]">Multi Function Hall
            <input type="checkbox" value="Jogging Track" name="aminities[]">Jogging Track<br>
    </div>

<script>

    jQuery(document).ready(function()
    {
        jQuery('#submit').click(function()
        {
             var aminities = $('input[type=checkbox]:checked').map(function(_, el) {
        return $(el).val();
    }).get();


        var jsonString = JSON.stringify(aminities);


            jQuery.ajax(
            {
                type:"POST",
                url:"sample_project_details.php",
                data: {data : jsonString},
                cache: false,
                success:function(data)
                {
                    alert('OK');
                }
            });
        });
    });

</script>

<?php

mysql_connect("localhost","root","myfourwalls");

mysql_select_db("test");


$aminitiesData = json_decode(stripslashes($_POST['data']));

?>

What should I do store the selected checkbox values to MYSQL DB(inside the column called aminities)?Number of selected values differ each time I Submit my Form.