Allow non-default port in MySQL connection

qa-config-example.php

@@ -29,6 +29,9 @@
 
 	For persistent connections, set the QA_PERSISTENT_CONN_DB at the bottom of this file; do NOT
 	prepend the hostname with 'p:'.
+
+	To use a non-default port, add the following line to the list of defines, with the appropriate port number:
+	define('QA_MYSQL_PORT', '3306');
 */
 
 	define('QA_MYSQL_HOSTNAME', '127.0.0.1');

qa-include/qa-base.php

@@ -262,6 +262,10 @@
 			define('QA_FINAL_EXTERNAL_USERS', QA_EXTERNAL_USERS);
 		}
 
+		if (defined('QA_MYSQL_PORT')) {
+			define('QA_FINAL_MYSQL_PORT', QA_MYSQL_PORT);
+		}
+
 	//	Possible URL schemes for Q2A and the string used for url scheme testing
 
 		define('QA_URL_FORMAT_INDEX', 0);  // http://...../index.php/123/why-is-the-sky-blue

qa-include/qa-db.php

@@ -60,10 +60,11 @@
 			return;
 
 		// in mysqli we connect and select database in constructor
-		if (QA_PERSISTENT_CONN_DB)
-			$db = new mysqli('p:'.QA_FINAL_MYSQL_HOSTNAME, QA_FINAL_MYSQL_USERNAME, QA_FINAL_MYSQL_PASSWORD, QA_FINAL_MYSQL_DATABASE);
+		$host = QA_PERSISTENT_CONN_DB ? 'p:'.QA_FINAL_MYSQL_HOSTNAME : QA_FINAL_MYSQL_HOSTNAME;
+		if (defined('QA_FINAL_MYSQL_PORT'))
+			$db = new mysqli($host, QA_FINAL_MYSQL_USERNAME, QA_FINAL_MYSQL_PASSWORD, QA_FINAL_MYSQL_DATABASE, QA_FINAL_MYSQL_PORT);
 		else
-			$db = new mysqli(QA_FINAL_MYSQL_HOSTNAME, QA_FINAL_MYSQL_USERNAME, QA_FINAL_MYSQL_PASSWORD, QA_FINAL_MYSQL_DATABASE);
+			$db = new mysqli($host, QA_FINAL_MYSQL_USERNAME, QA_FINAL_MYSQL_PASSWORD, QA_FINAL_MYSQL_DATABASE);
 
 		// must use procedural `mysqli_connect_error` here prior to 5.2.9
 		$conn_error = mysqli_connect_error();