PHP - Array Not Being Inserted Into Database

<form action="" id="SignUpForm" autocomplete="on" style="display:none" method="post"> <!-- Form is Hidden until the user is clicking the "Sign Up" button. -->
<input type="hidden" name="Language" value="English">
Fill up the following fields:<br><br>
First name:<input type="text" name="fname" required><br><br>
Last name: <input type="text" name="lname" required><br><br>
Age: <input type="number" name="UserAge" min="1" max="120" required><br><br>
Gender: <input type="radio" name="Gender" value="male">Male<br>
<input type="radio" name="Gender" value="Female">Female<br>
E-mail Address: <input type="email" name="email" autocomplete="off" required><br><br>
Pick your new password: <input type="password"  maxlength=”40” name="Password" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,40}"> Add password strength checker here.<br><br> <!-- Uses regular expression. -->
Confirm Password:  <input type="password" maxlength=”40” name="ConfirmPassword" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,40}"><br><br> <!-- A better way is to use onblur to check user's type match. -->
 <hr>
 <script>
 (function(){
        $("#submit").click(function(){
        $(".error").hide(); //Bind an event handler to the "error" JavaScript event.
        var hasError = false;
        var passwordVal = $("#Password").val();
        var checkVal = $("#ConfirmPassword").val();
        if (passwordVal == '') {
            $("#Password").after('<span class="error">Please enter a password.</span>');
            hasError = true;
        } else if (checkVal == '') {
            $("#ConfirmPassword").after('<span class="error">Please re-enter your password.</span>');
            hasError = true;
        } else if (passwordVal != checkVal ) {
            $("#ConfirmPassword").after('<span class="error">Passwords do not match.</span>');
            hasError = true;
        }
        if(hasError == true) {return false;}
    });
});
 </script>
 
<script>
//The validationMessage property of a DOM node contains the message the browser displays to the user when a node's validity is checked and fails.
document.getElementById("name").validationMessage;
document.getElementById("lname").validationMessage;
document.getElementById("UserAge").validationMessage;
document.getElementById("Gender").validationMessage;
document.getElementById("email").validationMessage;
document.getElementById("Password").validationMessage;
document.getElementById("ConfirmPassword").validationMessage;
</script>

Now let's go through your prefered food. Check the appropriate boxed beyond.<br><br>
This will help us to better understand your food discipline:<br>

<p style="text-align:center"><b> Meat And Poultry:</b></p>
<div id="MeatCheckBox">
<input type="checkbox" name="FoodTypes[]" value="Hamburger">Hamburger<br>
<input type="checkbox" name="FoodTypes[]" value="Steak">Steak<br>
<input type="checkbox" name="FoodTypes[]" value="GroundBeef">Ground Beef<br>
<input type="checkbox" name="FoodTypes[]" value="Bacon">Bacon<br>
<input type="checkbox" name="FoodTypes[]" value="Beef">Beef<br>
<input type="checkbox" name="FoodTypes[]" value="Salami">Salami<br>
<input type="checkbox" name="FoodTypes[]" value="Chicken">Chicken (In all its forms)<br>
<input type="checkbox" name="FoodTypes[]" value="NoMeat">I don't eat meat at all (Vegeterian/Vegan)<br>

</div>
 <p style="text-align:center"><b> Fish And Seafood:</b></p>
 <div id="FishAndSeaFood">
 <input type="checkbox" name="FoodTypes[]" value="Fish">Fish<br>
 <input type="checkbox" name="FoodTypes[]" value="Sushi">Sushi<br>
  <input type="checkbox" name="FoodTypes[]" value="CannedFish">Canned Fish<br>
  <input type="checkbox" name="FoodTypes[]" value="Oysters">Seafood<br>
    <input type="checkbox" name="FoodTypes[]" value="SmokedSalmon">Smoked Salmon<br>
  </div>
 
 <div id="Vegetables">
 <p style="text-align:center"><b> Do you eat vegtables?</b></p><br>
 <input type="radio" name="YesOrNo" value="Yes">Yes <!-- Give both options the same name,Because they are related. -->
<input type="radio" name="YesOrNo" value="No">No<br>
 </div>
 <hr>
 

<p>Do you workout as part of your lifestyle?</p><br>
<input type="radio" name='workout_options' value='valuable' data-id="DoWorkout" class="workout_options" /> I do workout occasionally
<input type="radio" name='workout_options' value='valuable' data-id="DoNotWorkout" class="workout_options" /> I am not working out<br><br><br>
<section>
    <div id=DoWorkout class="workout_options"><p>We see you're not having any exercise at the moment.<br><br>Did you know that doing some kind of activity like running or cardio 3 times a week improve your life quality?<br><br>We'll help you go straight from zero to hero!</p></div>
    <div id=DoNotWorkout class="workout_options">What type of workout you're working on at the moment? Please choose from the options beyond:<br><br><br>
    
    <input type="checkbox" name="Cardio" value="Cardio" data-id="Cardio"/>Cardio/Aerobics<br><br> 
    <input type="checkbox" name=" Weight_Lifting" value=" Weight_Lifting" data-id="Weight_Lifting"/>Weight Lifting/ Anaerobics</div><br>
</section>

<input type="submit" value="Sign Up!" id="submit">

</div>
</form>

<?php
// connnecting to MYSQL with PDO.

// Connection data (server_address, database, username, password)
$hostdb = 'localhost';
$namedb = 'caf_users';
$userdb = 'root';
$passdb = 'mypassword';

if (isset($_POST['SignUpButton'])) {

$yesOrNo=$_POST["YesOrNo"];
$firstName=$_POST["fname"];
$lastName=$_POST["lname"];
$userGender=$_POST["Gender"];
$emailAddress=$_POST["email"];
//check if user entered the exact password twice.
if ($_POST["password"] === $_POST["confirm_password"]) {
	$password=$_POST["password"];
	$hash = password_hash($passwod, PASSWORD_DEFAULT);}
	// The first parameter is the password string that needs to be hashed,
	//and the second parameter specifies the algorithm that should be used for generating the hash.
	//encrypted by bcrypt algorithm.
	else {
		echo "Passwords are mismatched. Please try again.";
	};
	$userAge=$_POST["UserAge"];
// Display message if successfully connect, otherwise retains and outputs the potential error
try {
	$conn = new PDO("mysql:host=$hostdb; dbname=$namedb", $userdb, $passdb); //Initiate connection witht the PDO object instance.
	$conn->exec("SET CHARACTER SET utf8");  // Sets encoding UTF-8
	echo 'Connected to database';

	// Define an insert query
	$sql = "INSERT INTO `users` ('Workout','first_name','last_name','gender','Email_Address','Password','User_Age')
	VALUES
	($YesOrno,$fname,$lname,$Gender,$email,$password,$UserAge)";
	$count = $conn->exec($sql);

	$conn = null;        // Disconnect
	if($count !== false) echo 'Number of rows added: '. $count;
}
catch(PDOException $e) {
	echo $e->getMessage();
}
}
	?>

<?php   
    require '../db.php';
    $paypalmode     =   '.sandbox';        
    $req = 'cmd=' . urlencode('_notify-validate');
    foreach ($_POST as $key => $value) {
        $value = urlencode(stripslashes($value));
        $req .= "&$key=$value";
    }
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://www'.$paypalmode.'.paypal.com/cgi-bin/webscr');
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Host: www'.$paypalmode.'.paypal.com'));
    $res = curl_exec($ch);
    curl_close($ch);

    if (strcmp ($res, "VERIFIED") == 0)
    {
        $transaction_id = $_POST['txn_id'];
        $payerid = $_POST['payer_id'];
        $firstname = $_POST['first_name'];
        $lastname = $_POST['last_name'];
        $payeremail = $_POST['payer_email'];
        $paymentdate = $_POST['payment_date'];
        $paymentstatus = $_POST['payment_status'];
        $mdate= date('Y-m-d h:i:s',strtotime($paymentdate));
        $otherstuff = json_encode($_POST);
        $date = date("y-m-d");
        
            $q = $pdo->connect()->query("INSERT INTO payment (mid,username,amount,paypal_id,txn_id,received_date)   VALUES('{$_SESSION['user_id']}','{$_SESSION['uname']}','{$_POST['mc_gross']}','{$_POST['payer_email']}','{$_POST['txn_id']}','$date')");
            $q->execute();
            $q1 = $pdo->connect()->query("UPDATE members SET amount_loaded = amount_loaded + {$_SESSION['amount']} WHERE mid = '{$_SESSION['user_id']}'");
            $q1->execute();
            //header("Location: funds.php");
            echo "verified";
        
        
}



?>

Am a newbie in php. Since I can't insert values to the database with respect to a user Id or with any other token using WHERE clause.

I.e "INSERT INTO receipts(date) VALUES(example) where id="**....."

If I need to fetch several values of column for a particular user, how do I go about it? Thank you!!!