My code about filterable audio searching, here how can i add Add-To-Cart functionality?

code :
index.php

<?php 

//index.php

include('database_connection.php');

?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="description" content=""> <meta name="author" content=""> <title>Voice Repository</title> <script src="js/jquery-1.10.2.min.js"></script> <script src="js/jquery-ui.js"></script> <script src="js/bootstrap.min.js"></script> <link rel="stylesheet" href="css/bootstrap.min.css"> <link href = "css/jquery-ui.css" rel = "stylesheet"> <!-- Custom CSS --> <link href="css/style.css" rel="stylesheet"> </head> <body> <!-- Page Content --> <div class="container"> <div class="row"> <br /> <div class="col-md-12"> <h2 align="center">Voice Repository Bank</h2> </div> <div class="col-md-3"> <!-- Price --> <!-- <div class="list-group"> <h3>Price</h3> <input type="hidden" id="hidden_minimum_price" value="0" /> <input type="hidden" id="hidden_maximum_price" value="65000" /> <p id="price_show">1000 - 65000</p> <div id="price_range"></div> </div> --> <!-- Languages  --> <div class="list-group"> <h3>Languages</h3> <?php
                    $query = "
                    SELECT DISTINCT(voice_languages) FROM voice_bank_data WHERE voice_status = '1' ORDER BY voice_languages DESC
                    ";
                    $statement = $connect->prepare($query);
                    $statement->execute();
                    $result = $statement->fetchAll();
                    foreach($result as $row)
                    {
                    ?> <div class="list-group-item checkbox"> <label><input type="checkbox" class="common_selector languages" value="<?php echo $row['voice_languages']; ?>"  > <?php echo $row['voice_languages']; ?> </label> </div> <?php
                    }
                    ?> </div> <!-- Genres  --> <div class="list-group"> <h3>Genres</h3> <?php

                    $query = "
                    SELECT DISTINCT(voice_genres) FROM voice_bank_data WHERE voice_status = '1' ORDER BY voice_genres DESC
                    ";
                    $statement = $connect->prepare($query);
                    $statement->execute();
                    $result = $statement->fetchAll();
                    foreach($result as $row)
                    {
                    ?> <div class="list-group-item checkbox"> <label><input type="checkbox" class="common_selector genres" value="<?php echo $row['voice_genres']; ?>" > <?php echo $row['voice_genres']; ?> </label> </div> <?php    
                    }

                    ?> </div> <!-- Voice Modulation --> <div class="list-group"> <h3>Voice Modulation</h3> <?php
                    $query = "
                    SELECT DISTINCT(voice_voice_modulation) FROM voice_bank_data WHERE voice_status = '1' ORDER BY voice_voice_modulation DESC
                    ";
                    $statement = $connect->prepare($query);
                    $statement->execute();
                    $result = $statement->fetchAll();
                    foreach($result as $row)
                    {
                    ?> <div class="list-group-item checkbox"> <label><input type="checkbox" class="common_selector voice_modulation" value="<?php echo $row['voice_voice_modulation']; ?>"  > <?php echo $row['voice_voice_modulation']; ?> </label> </div> <?php
                    }
                    ?> </div> <!-- Gender  --> <div class="list-group"> <h3>Gender</h3> <div style="height: 180px; overflow-y: auto; overflow-x: hidden;"> <?php

                    $query = "SELECT DISTINCT(voice_gender) FROM voice_bank_data WHERE voice_status = '1' ORDER BY voice_id DESC";
                    $statement = $connect->prepare($query);
                    $statement->execute();
                    $result = $statement->fetchAll();
                    foreach($result as $row)
                    {
                    ?> <div class="list-group-item checkbox"> <label><input type="checkbox" class="common_selector gender" value="<?php echo $row['voice_gender']; ?>"  > <?php echo $row['voice_gender']; ?></label> </div> <?php
                    }

                    ?> </div> </div> <!-- Jingle Moods --> <div class="list-group"> <h3>Jingle Moods</h3> <?php
                    $query = "
                    SELECT DISTINCT(voice_jingle_moods) FROM voice_bank_data WHERE voice_status = '1' ORDER BY voice_jingle_moods DESC
                    ";
                    $statement = $connect->prepare($query);
                    $statement->execute();
                    $result = $statement->fetchAll();
                    foreach($result as $row)
                    {
                    ?> <div class="list-group-item checkbox"> <label><input type="checkbox" class="common_selector jingle_moods" value="<?php echo $row['voice_jingle_moods']; ?>"  > <?php echo $row['voice_jingle_moods']; ?> </label> </div> <?php
                    }
                    ?> </div> <!-- IVR --> <div class="list-group"> <h3>Ivr</h3> <?php
                    $query = "
                    SELECT DISTINCT(voice_ivr) FROM voice_bank_data WHERE voice_status = '1' ORDER BY voice_ivr DESC
                    ";
                    $statement = $connect->prepare($query);
                    $statement->execute();
                    $result = $statement->fetchAll();
                    foreach($result as $row)
                    {
                    ?> <div class="list-group-item checkbox"> <label><input type="checkbox" class="common_selector ivr" value="<?php echo $row['voice_ivr']; ?>"  > <?php echo $row['voice_ivr']; ?> </label> </div> <?php
                    }
                    ?> </div> </div> <div class="col-md-9"> <br /> <div class="row filter_data"> </div> </div> </div> </div> <style>
#loading
{
    text-align:center; 
    background: url('loader.gif') no-repeat center; 
    height: 150px;
}
</style> <script>
$(document).ready(function(){

    filter_data();

    function filter_data()
    {
        $('.filter_data').html('<div id="loading" style="" ></div>');
        var action = 'fetch_data';

        // var minimum_price = $('#hidden_minimum_price').val();
        // var maximum_price = $('#hidden_maximum_price').val();

        var gender = get_filter('gender');
        var genres = get_filter('genres');
        var voice_modulation = get_filter('voice_modulation');
        var languages = get_filter('languages');
        var jingle_moods = get_filter('jingle_moods');
        var ivr = get_filter('ivr');
        $.ajax({
            url:"fetch_data.php",
            method:"POST",
            data:
            {
                action:action, 
                // minimum_price:minimum_price, 
                // maximum_price:maximum_price,
                gender:gender,
                genres:genres, 
                voice_modulation:voice_modulation,
                languages:languages,
                jingle_moods:jingle_moods,
                ivr:ivr
            },
                success:function(data)
                {
                $('.filter_data').html(data);
                }
        });
    }

    function get_filter(class_name)
    {
        var filter = [];
        $('.'+class_name+':checked').each(function(){
            filter.push($(this).val());
        });
        return filter;
    }

    $('.common_selector').click(function(){
        filter_data();
    });

    // $('#price_range').slider({
    //     range:true,
    //     min:1000,
    //     max:65000,
    //     values:[1000, 65000],
    //     step:500,
    //     stop:function(event, ui)
    //     {
    //         $('#price_show').html(ui.values[0] + ' - ' + ui.values[1]);
    //         $('#hidden_minimum_price').val(ui.values[0]);
    //         $('#hidden_maximum_price').val(ui.values[1]);
    //         filter_data();
    //     }
    // });

});
</script> </body> </html>

and my

data fetching file,
data_fetch.php

<?php

//fetch_data.php

include('database_connection.php');

if(isset($_POST["action"]))
{
    $query = "
        SELECT * FROM voice_bank_data WHERE voice_status = '1'
    ";

    // if(isset($_POST["minimum_price"], $_POST["maximum_price"]) && !empty($_POST["minimum_price"]) && !empty($_POST["maximum_price"]))
    // {
    //  $query .= "
    //   AND product_price BETWEEN '".$_POST["minimum_price"]."' AND '".$_POST["maximum_price"]."'
    //  ";
    // }

    // Gender
    if(isset($_POST["gender"]))
    {
        $gender_filter = implode("','", $_POST["gender"]);
        $query .= "
         AND voice_gender IN('".$gender_filter."')
        ";
    }

    // Genres
    if(isset($_POST["genres"]))
    {
        $genres_filter = implode("','", $_POST["genres"]);
        $query .= "
         AND voice_genres IN('".$genres_filter."')
        ";
    }

    // Voice Modulation
    if(isset($_POST["voice_modulation"]))
    {
        $voice_modulation_filter = implode("','", $_POST["voice_modulation"]);
        $query .= "
         AND voice_voice_modulation IN('".$voice_modulation_filter."')
        ";
    }

    // Languages
    if(isset($_POST["languages"]))
    {
        $languages_filter = implode("','", $_POST["languages"]);
        $query .= "
         AND voice_languages IN('".$languages_filter."')
        ";
    }

    // Jingle Moods
    if(isset($_POST["jingle_moods"]))
    {
        $jingle_moods_filter = implode("','", $_POST["jingle_moods"]);
        $query .= "
         AND voice_jingle_moods IN('".$jingle_moods_filter."')
        ";
    }

    // IVR
    if(isset($_POST["ivr"]))
    {
        $ivr_filter = implode("','", $_POST["ivr"]);
        $query .= "
         AND voice_ivr IN('".$ivr_filter."')
        ";
    }

    $statement = $connect->prepare($query);
    $statement->execute();
    $result = $statement->fetchAll();
    $total_row = $statement->rowCount();
    $output = '';
    if($total_row > 0)
    {
        foreach($result as $row)
        {
            $output .= '
            <div class="col-sm-3 col-lg-4 col-md-3"> <div style="border:1px solid #ccc; border-radius:5px; padding:10px; margin-bottom:16px; height:300px;"> <audio controls controlsList="nodownload" style="padding: 10px 10px 10px 10px;margin-left: -21px;"> <source src="audio_sample/'. $row['voice_audio_file'] .'" alt="" class="img-responsive"> </audio> <p align="center"><strong> '. $row['voice_name'] .'</strong></p> <p style="font-size: 12px;">
                    Gender            : '. $row['voice_gender'].' <br />
                    Genres            : '. $row['voice_genres'].' <br />
                    Voice Modulation  : '. $row['voice_voice_modulation'].' <br />
                    Languages         : '. $row['voice_languages'].' <br />
                    Jingle Moods      : '. $row['voice_jingle_moods'].' <br />
                    Ivr               : '. $row['voice_ivr'].' <br /> </p> <button class="btn btn-primary" type="submit" style="padding: 5px 83px 5px 83px;"> Add to PlayList </button> </div> </div>
            ';
        } 
    }
    else 
    {
        $output = '<h3>No Data Found</h3>';
    }
    echo $output;
}
?>

How can i add add-to-cart functionality.
Note : In the cart just voice_id, voice_name, not necessary qty & price.
My current output:

https://snag.gy/xQ8TXP.jpg