Functions

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Filters
Filters let you modify the value of a variable in place before it is rendered. A pipe | passes the value of a variable as input to a filter. Multiple filters can be chained, so that the output of one filter is used as the input for the next one. Besides filters, basic mathematical operations can be used in the same way.
Functions
Functions provide a collection of essential tools for templates. While some of them are just convenient shorthands for more complex statements, others provide the main interface to configure collections, create redirects, work with query strings or define variables during runtime.
Custom Functions
Custom functions provide a quick and easy way to add your own functionality to a theme using plain PHP. In contrast to extensions, custom functions are not meant to be distributed as separate packages. Instead, they live right inside your theme and can be defined in a single statement without the need for any class files or autoloading setup. Once defined, a custom function is used in templates just like any other function.