file required validation in php | file compulsory upload valiadtion in php | select box validation

in this video avadh tutor provide input type file required validation in php how to compulsory and necessary file is required inside php how check select combo box drop down box is required check

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ripal pandya
avadh tutor

[noorahuja]

Hi, I'm having an error (Undefined array key "selectMenuLocation"). menuName is a text field and selectMenuLocation is a dropdown.
$menuName = $_POST['menuName'];
$menuLocation =
if($menuName=="" and $menuLocation=="" ) {
echo "Enter all fields.";
}
else if($menuName=="" or $menuLocation=="" ) {
echo "Check all fields.";
}
else {
$sqll = "INSERT INTO menu(menuName, menuLocation) VALUES ('$menuName', '$menuLocation')";
mysqli_query($conn, $sqll);
}