Add is_https() as a common function
diff --git a/user_guide_src/source/general/common_functions.rst b/user_guide_src/source/general/common_functions.rst
index 99126f9..f3d48ac 100644
--- a/user_guide_src/source/general/common_functions.rst
+++ b/user_guide_src/source/general/common_functions.rst
@@ -7,7 +7,7 @@
loading any libraries or helpers.
is_php('version_number')
-==========================
+========================
is_php() determines of the PHP version being used is greater than the
supplied version_number.
@@ -24,7 +24,7 @@
version of PHP is lower than the supplied version number.
is_really_writable('path/to/file')
-====================================
+==================================
is_writable() returns TRUE on Windows servers when you really can't
write to the file as the OS reports to PHP as FALSE only if the
@@ -44,7 +44,7 @@
}
config_item('item_key')
-=========================
+=======================
The :doc:`Config library <../libraries/config>` is the preferred way of
accessing configuration information, however config_item() can be used
@@ -56,8 +56,8 @@
These are each outlined on the :doc:`Error Handling <errors>` page.
-set_status_header(code, 'text');
-================================
+set_status_header(code, 'text')
+===============================
Permits you to manually set a server status header. Example::
@@ -68,19 +68,25 @@
a full list of headers.
remove_invisible_characters($str)
-===================================
+=================================
This function prevents inserting null characters between ascii
characters, like Java\\0script.
html_escape($mixed)
-====================
+===================
-This function provides short cut for htmlspecialchars() function. It
+This function provides short cut for ``htmlspecialchars()`` function. It
accepts string and array. To prevent Cross Site Scripting (XSS), it is
very useful.
get_mimes()
-=============
+===========
-This function returns the MIMEs array from config/mimes.php.
\ No newline at end of file
+This function returns the MIMEs array *from config/mimes.php*.
+
+is_https()
+==========
+
+Returns TRUE if a secure (HTTPS) connection is used and FALSE
+in any other case (including non-HTTP requests).
\ No newline at end of file