php - MySQL INSERT ステートメントがエラーを返すのはなぜですか? PDOException SQLSTATE[42000]:

Question

何が起こっているのかよくわからないという mySQL の問題があります。それが私の構文に関係していることは知っていますが、正確にはわかりません。

if(isset($_POST['newBtn'])) {
// Check that everything has values and something has been changed
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$title = $_POST['title'];
$smalldesc = $_POST['smalldesc'];
$fulldesc = $_POST['fulldesc'];
// username = $admin
// date = getdate(today in unix time stamp)
date_default_timezone_set('UTC');
$date = new DateTime();
$date = $date->getTimestamp();
if("Testing form. Not relevant.") {
    echo "<div class='alert alert-warning'>You submitted blank data somewhere, or did not change any data from it's default.</div>";
} else {
    $sqladd = "INSERT INTO theories(theory_name,small_desc,full_desc,author,create_date) VALUES ($title,$smalldesc,$fulldesc,$admin,$date)";
    try {
    $sth = $dbh->query($sqladd);

    echo "<div class='alert alert-success'><b>Success!</b>You Have created a new theory that is availible for viewing to the public.</div>";
} catch(PDOExecption $e) {
echo "<div class='alert alert-error'><b>Error!</b>Could not add to database.<br />". $e->getMessage() ."</div>";
}
}
}

そして、私はこのエラーを受け取ります:

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax
error or access violation: 1064 You have an error in your SQL syntax; check the manual that
corresponds to your MariaDB server version for the right syntax to use near 'Form,I 
shouldn't be having this much of an issue with php.,I really hate when PH' at line 1' in 
/srv/http/mt-chillad/users/admin-theories.php:42 Stack trace: #0 /srv/http/mt-
chillad/users/admin-theories.php(42): PDOStatement->execute() #1 {main} thrown in 
/srv/http/mt-chillad/users/admin-theories.php on line 42