Can't write data to database - php

Question

I am trying to write a simple application with PHP to write and receive data from a database. I am able to retrieve data already in the database through my PHP script, but I can not write anything to it. When I try, I do not get any errors - just the title of my script and a blank screen.
My code is as follows:
My HTML
<form action="insert_book.php" method="post">
<fieldset>
<p><label for="ISBN">ISBN</label>
<input type="text" id="ISBN" name="ISBN" maxlength="13" size="13" /></p>
<p><label for="Author">Author</label>
<input type="text" id="Author" name="Author" maxlength="30" size="30" /></p>
<p><label for="Title">Title</label>
<input type="text" id="Title" name="Title" maxlength="60" size="30" /></p>
<p><label for="Price">Price</label>
$ <input type="text" id="Price" name="Price" maxlength="7" size="7" /></p>
</fieldset>
<p><input type="submit" value="Add New Book" /></p>
</form>
PHP
<?php
if(!isset($_POST['ISBN']) || !isset($_POST['Author'])
|| !isset($_POST['Title']) || !isset($_POST['Price'])) {
echo "<p>You have not entered all the details.<br/>
Go back and try again.</p>";
exit;
}
// create short variable names
$isbn=$_POST['ISBN'];
$author=$_POST['Author'];
$title=$_POST['Title'];
$price=$_POST['Price'];
$price = doubleval($price);
#$db = new mysqli('localhost', 'jay', '******', 'Books');
if (msqli_connect_errno()) {
echo '<p>Error: Could not connect to database.<br/>
Please try again.</p>';
exit;
}
$query = "INSERT INTO Books VALUES (?, ?, ?, ?)";
$stmt = $db->prepare($query);
$stmt->bind_param('sssd', $isbn, $author, $title, $price);
$stmt->execute();
if ($stmt->affected_rows > 0) {
echo '<p>Submission successful.</p>';
} else {
echo '<p>An Aweful error occured.<br/>
Nothing was added.</p>';
}
$db->close();
?>
Please let me know if you can see any issues.
Thanks!

Answer 1

You have an error in this line:
if (msqli_connect_errno()) {
It should be
if (mysqli_connect_errno()) {
You missed a y.