[ticket/12730] Add Google+ profile field type

Google+ has a "+" before a custom URL but doesn't for those which are using
their integer ID. To cover that we need to have an extra profile field

PHPBB3-12730

phpBB/phpbb/profilefields/type/type_googleplus.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\profilefields\type;
+
+class type_googleplus extends type_string
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function get_name_short()
+    {
+        return 'googleplus';
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function get_default_option_values()
+    {
+        return array(
+            'field_length'		    => 20,
+            'field_minlen'		    => 3,
+            'field_maxlen'		    => '',
+            'field_validation'	    => '[\w]+',
+            'field_novalue'		    => '',
+            'field_default_value'	=> '',
+        );
+    }
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function get_profile_contact_value($field_value, $field_data)
+	{
+		if (!$field_value && !$field_data['field_show_novalue'])
+		{
+			return null;
+		}
+
+		if (!is_numeric($field_value))
+			$field_value = '+' . $field_value;
+
+		return $field_value;
+	}
+}