PHP. Руководство по PHP. 2005
mysqli_connect_errno
mysqli_connect_errno
Description
int mysqli_connect_errno (void)The mysqli_connect_errno() function will return the last error code number
for last call to mysqli_connect().
If no errors have occured, this function will return zero.
Замечание:
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.