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+\$use\_include\_path {#variable.use.include.path}
+====================
+
+This tells smarty to respect the
+[include\_path](&url.php-manual;ini.core.php#ini.include-path) within
+the [`File Template Resource`](#resources.file) handler and the plugin
+loader to resolve the directories known to
+[`$template_dir`](#variable.template.dir). The flag also makes the
+plugin loader check the include\_path for
+[`$plugins_dir`](#variable.plugins.dir).
+
+> **Note**
+>
+> You should not design your applications to rely on the include\_path,
+> as this may - depending on your implementation - slow down your system
+> (and Smarty) considerably.
+
+If use\_include\_path is enabled, file discovery for
+[`$template_dir`](#variable.template.dir) and
+[`$plugins_dir`](#variable.plugins.dir) work as follows.
+
+-   For each element `$directory` in array (\$template\_dir or
+    \$plugins\_dir) do
+
+-   Test if requested file is in `$directory` relative to the [current
+    working directory](&url.php-manual;function.getcwd.php). If file
+    found, return it.
+
+-   For each `$path` in include\_path do
+
+-   Test if requested file is in `$directory` relative to the `$path`
+    (possibly relative to the [current working
+    directory](&url.php-manual;function.getcwd.php)). If file found,
+    return it.
+
+-   Try default\_handler or fail.
+
+This means that whenever a directory/file relative to the current
+working directory is encountered, it is preferred over anything
+potentially accessible through the include\_path.
+
+> **Note**
+>
+> Smarty does not filter elements of the include\_path. That means a
+> \".:\" within your include path will trigger the current working
+> directory lookup twice.
+
+See also [`Template Resources`](#resources) and
+[`$template_dir`](#variable.template.dir)