int $mysqli->connect_errno;
int mysqli_connect_errno ( void )
Returns the last error code number from the last call to mysqli_connect().
Client error message numbers are listed in the MySQL errmsg.h header file, server error message numbers are listed in mysqld_error.h. In the MySQL source distribution you can find a complete list of error messages and error numbers in the file Docs/mysqld_error.txt.
The mysqli_connect_errno() function returns the error code from the last connection error, if any.
Object oriented style
Procedural style
The above examples will output:
Connect Error: 1045
An error code value for the last call to mysqli_connect(), if it failed. zero means no error occurred.