Insert data into custom table from fetching $_POST values

if(!empty($_POST))
  {
    $player_name = $_POST['first_name'];
    $payer_email = $_POST['payer_email'];
    $payment_gross = $_POST['payment_gross'];
    $payment_date = $_POST['payment_date'];
    $payer_id = $_POST['payer_id'];

    $paypal_str = array($player_name, $payer_email, $payment_gross, $payment_date, $payer_id);
 print_r($paypal_str);

global $wpdb;
$wpdb->insert(
    'paypal',
     array(
        'name' =>  $paypal_str[0],
        'email' => $paypal_str[1],
        'amount' => $paypal_str[2],
        'player_id' => $paypal_str[3],
        'date' => $paypal_str[4]
    )
);
}

Remove the unwanted comma from the array.