PHP. Руководство по PHP. 2005
mysqli_connect_error
mysqli_connect_error
Description
string mysqli_connect_error (void)The mysqli_connect_error() function is identical to the corresponding
mysqli_connect_errno() function in every way, except instead of returning
an integer error code the mysqli_connect_error() function will return
a string representation of the last error to occur for the last
mysqli_connect() call.
If no error has occured, this function will return an empty string.
Примеры
mysqli_connect_errno
mysqli_connect
Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.