A prepared statement resource that was returned by the sasql_prepare function.
A string that contains one or more characters specifying the types of the corresponding bind. This can be any of: s for string, i for integer, d for double, b for blobs. The length of the $types string must match the number of parameters that follow the $types parameter ($var_1,
$var_2, ...). The number of characters should also match the number of parameter markers (question marks) in the prepared