docs: Comment on database.php about adding `PDO::ATTR_STRINGIFY_FETCH…

…ES => true` flag in PHP 8.1

Comment on how to set up when using PDO MySQL/SQLite driver with connection flags unspecified and PHP 8.1 to keep the type when retrieving integer/float columns.

app/Config/database.php.default

@@ -49,7 +49,7 @@
  * database. Uses database default not specified.
  *
  * sslmode =>
- * For Postgres specifies whether to 'disable', 'allow', 'prefer', or 'require' SSL for the 
+ * For Postgres specifies whether to 'disable', 'allow', 'prefer', or 'require' SSL for the
  * connection. The default value is 'allow'.
  *
  * unix_socket =>
@@ -75,6 +75,15 @@ class DATABASE_CONFIG {
 		'database' => 'database_name',
 		'prefix' => '',
 		//'encoding' => 'utf8',
+
+		// PDO MySQL/SQLite Driver had the following backward incompatible changes in PHP 8.1
+		// * https://www.php.net/manual/en/migration81.incompatible.php#migration81.incompatible.pdo.mysql
+		// * https://www.php.net/manual/en/migration81.incompatible.php#migration81.incompatible.pdo.sqlite
+		// If under PHP 8.1 and didn't use the following flags, adding them will cause integer and float columns
+		// in the result set to be strings as before.
+		//	'flags' => array(
+		//		PDO::ATTR_STRINGIFY_FETCHES => true
+		//	)
 	);
 
 	public $test = array(
@@ -86,5 +95,9 @@ class DATABASE_CONFIG {
 		'database' => 'test_database_name',
 		'prefix' => '',
 		//'encoding' => 'utf8',
+
+		//	'flags' => array(
+		//		PDO::ATTR_STRINGIFY_FETCHES => true
+		//	)
 	);
 }