mysqli_stmt_bind_param() is used to bind variables for the
parameter markers in the SQL statement that was passed to
The string types contains one or more characters which specify
the types for the corresponding bind variables
Table 1. Type specification chars
corresponding variable has type integer
corresponding variable has type double
corresponding variable has type string
corresponding variable is a blob and will be send in packets
If data size of a variable exceeds max. allowed packet size
(max_allowed_packet), you have to specify b in
types and use
mysqli_stmt_send_long_data() to send the data in packets.
The number of variables and length of
string types must match the parameters in the statement.