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+# Custom modifiers
+
+Modifiers are little functions that are applied
+to a variable in the template before it is displayed or used in some
+other context. Smarty comes with a bunch of [modifiers](../../designers/language-modifiers/index.md), but you can 
+easily add your own.
+
+In order to do so, you must write a function that accepts as its first parameter the value on which the
+modifier is to operate. The rest of the parameters are optional, depending on what kind of operation is to be performed.
+
+The modifier has to return the result of its processing.
+
+For example:
+```php
+<?php
+
+function smarty_modifier_substr($string, $offset, $length) {
+    return substr($string, $offset, $length);
+}
+
+$smarty->registerPlugin(Smarty\Smarty::PLUGIN_MODIFIER, 'substr', 'smarty_modifier_substr');
+```
+
+You can now use this in your templates as follows:
+```smarty
+{$applicationName|substr:0:20}
+```