Which of these returns a string containing an error message?

Solution (By Examveda Team)

This question asks about a function in MySQL that gives you information about errors. Here's a breakdown of the options:
Option A: mysql_error() This function returns a string that contains the error message generated by the most recent MySQL operation. This is exactly what we are looking for!
Option B: mysql_errno() This function returns an integer value representing the error number of the most recent MySQL operation. This is not a textual error message.
Option C: mysql_sqlstate() This function returns a five-character string representing the SQLSTATE error code for the most recent MySQL operation. This is a standardized error code, not a full error message.
Option D: mysql_close() This function closes the connection to a MySQL server. It doesn't provide any information about errors.
Therefore, the answer is Option A: mysql_error().