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-rw-r--r--user_guide_src/source/general/common_functions.rst15
1 files changed, 14 insertions, 1 deletions
diff --git a/user_guide_src/source/general/common_functions.rst b/user_guide_src/source/general/common_functions.rst
index 7f327f00b..22f8d1942 100644
--- a/user_guide_src/source/general/common_functions.rst
+++ b/user_guide_src/source/general/common_functions.rst
@@ -93,4 +93,17 @@ 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
+in any other case (including non-HTTP requests).
+
+function_usable($function_name)
+===============================
+
+Returns TRUE if a function exists and is usable, FALSE otherwise.
+
+This function runs a ``function_exists()`` check and if the
+`Suhosin extension <http://www.hardened-php.net/suhosin/>` is loaded,
+checks if it doesn't disable the function being checked.
+
+It is useful if you want to check for the availability of functions
+such as ``eval()`` and ``exec()``, which are dangerous and might be
+disabled on servers with highly restrictive security policies. \ No newline at end of file