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Fatal error: Call to undefined function mysql_error() in C:\inetpub\wwwroot\wiki\includes\db\DatabaseMysql.php on line 305

This is the code in the file (which comes from a plain vanilla install) with the arrow pointing to the line the error refers to:

	function lastError() {
		if ( $this->mConn ) {
			# Even if it's non-zero, it can still be invalid
			wfSuppressWarnings();
			$error = mysql_error( $this->mConn );
			if ( !$error ) {
				$error = mysql_error();
			}
			wfRestoreWarnings();
		} else {
===>			$error = mysql_error();
		}
		if( $error ) {
			$error .= ' (' . $this->mServer . ')';
		}
		return $error;
	}