system/View/Parser.php
public function addPlugin(string $alias, callable $callback, bool $isPair = false)
	{
		$this->plugins[$alias] = $isPair ? [$callback] : $callback;

		return $this;
	}
public function addPlugin(string $alias, callable $callback, bool $isPair = false)
	{
		$this->plugins[$alias] = $isPair ? [$callback] : $callback;

		return $this;
	}
Makes a new plugin available during the parsing of the template.

@param string   $alias
@param callable $callback

@param boolean  $isPair

@return $this