related to #1693 changed smarty version to 4.1.0

include/smarty/docs/designers/language-basic-syntax/language-syntax-functions.md

@@ -0,0 +1,40 @@
+Functions {#language.syntax.functions}
+=========
+
+Every Smarty tag either prints a [variable](#language.variables) or
+invokes some sort of function. These are processed and displayed by
+enclosing the function and its [attributes](#language.syntax.attributes)
+within delimiters like so: `{funcname attr1="val1" attr2="val2"}`.
+
+
+    {config_load file="colors.conf"}
+
+    {include file="header.tpl"}
+    {insert file="banner_ads.tpl" title="My Site"}
+
+    {if $logged_in}
+        Welcome, <span style="color:{#fontColor#}">{$name}!</span>
+    {else}
+        hi, {$name}
+    {/if}
+
+    {include file="footer.tpl"}
+
+      
+
+-   Both [built-in functions](#language.builtin.functions) and [custom
+    functions](#language.custom.functions) have the same syntax within
+    templates.
+
+-   Built-in functions are the **inner** workings of Smarty, such as
+    [`{if}`](#language.function.if),
+    [`{section}`](#language.function.section) and
+    [`{strip}`](#language.function.strip). There should be no need to
+    change or modify them.
+
+-   Custom functions are **additional** functions implemented via
+    [plugins](#plugins). They can be modified to your liking, or you can
+    create new ones. [`{html_options}`](#language.function.html.options)
+    is an example of a custom function.
+
+See also [`registerPlugin()`](#api.register.plugin)