sc_lookup returning undefined constant error

Recordset customer is not being filled

sc_lookup (customer, “SELECT * FROM customers WHERE id = ‘2’”);

if (!empty({customer})) {

echo customer[0][0];

}else{
echo ‘failed’;
}

for sc_lookup you have to try this with your if
if(isset({customer[0][0]}))

{customer} is better used for a sc_select