Error adding data in mysql table using PHP - php

Question

I'm making a simple CURD operation using PHP and MYSQL. However I'm not able to insert/add data in the created table.
I think it might be a syntax error itself, but I can't figure out which one. The rest of the code works fine.
operation.php:
require_once("../CRUD/php/db.php");
$conn = createDB();
if(isset($_POST['create']))
{
createData();
}
function createData()
{
$name = textboxValue("name_type");
$age = textboxValue("age_type");
$gender = textboxValue("gender_type");
$email = textboxValue("email_type");
$contact = textboxValue("contact_type");
$dept = textboxValue("dept_type");
$sql = "INSERT INTO details(name,age,gender,email,contact,department)
VALUES('$name', '$age', '$gender', $email', '$contact', '$dept');";
if(mysqli_query($GLOBALS['conn'],$sql))
{
echo "Data added";
}
else
{
echo "Error adding data";
}
}
function textboxValue($value)
{
$textbox = mysqli_real_escape_string($GLOBALS['conn'], trim($_POST[$value]));
if(empty($textbox))
{
return false;
}
else
{
return $textbox;
}
}
"Error adding data" gets echoed. I can share the html code as well if needed.

Answer 1

$sql = "INSERT INTO details(name,age,gender,email,contact,department)
VALUES(\"$name\", \"$age\", \"$gender\", \"$email\", \"$contact\", \"$dept\");";
and so? By the way one quote you forgot near $email