Добавление в базу данных

function addToCatalog($title, $edible, $author, $pubyear, $price){
    global $link;
    $sql = 'INSERT INTO catalog (title, edible, author, pubyear, price) VALUES (?, ?, ?, ?, ?)';
    if (!$stmt = mysqli_prepare($link, $sql)){
        return false; 
    }
    mysqli_stmt_bind_param($stmt, "sssii", $title, $edible, $author, $pubyear, $price);
    mysqli_stmt_execute($stmt); 
    mysqli_stmt_close($stmt); 
    return true;
}

<?php
    require_once '../models/login.php';
    checkUser();
    require "../models/database.php";
    require "../models/functions.php";
    $title = trim($_POST['title']);
    $edible = trim($_POST['edible']);
    $author = trim($_POST['author']);
    $pubyear = trim($_POST['pubyear']);
    $price = trim($_POST['price']);
    addToCatalog($title, $edible, $author, $pubyear, $price);
    if(!addToCatalog($title, $edible, $author, $pubyear, $price)){ 
        echo 'Ошибка'; 
    } else { 
        header("Location: addtocatalog.php"); 
        exit; 
    }