Dynamic method example

DynamicMethodExample.php

<?php

interface IThingy
{
	function getClassifier() : string;
}

class DynamicMethodHost 
{
	private string $methodPrefix = "__handle";
	
	public function operateOnAThing(IThing $Thingy) : void
	{
		$methodName = $this->methodPrefix . $Thingy.getClassifier();
		
		// The other thing is that these could be injected strategies so they can
		// be composed, would just require it be a slightly different check
		if (method_exists($this, $methodName) {
			$this->{$methodName}($Thingy);
			return;
		}
		
		$this->defaultThingyHandler($Thingy);
	}
	
	private function defaultThingyHandler(IThing $Thingy) : void 
	{
		// whatever
	}
	
	private function __handleSpecificType(IThing $thingy) : void
	{
		// specific whatver
	}
}


class ThingyExample implements IThing
{
	private string $somethingWhatever = "specificType";
	
	public function __constructor(string $somethingWhatever)
	{
		$this->setSomethingWhatever($somethingWhatever);
	}
	
	public function getClassifier() : string
	{
		// honestly this could be anything from the string type of an enum to some
		// field in a data object (such as post type) to just the hecking class name
		return str_replace(" ", "", $this->somethingWhatever);
	}
	
	public function setSomethingWhatever(string $newSomethingWhatever) : void
	{
		$this->somethingWhatever = $newSomethingWhatever;
	}
}
				
// obviously you wouldn't just have these two things next to each other,
// these could be events passed into a handler or something like that.

$Host = new DynamicMethodHost();
$Subject = new ThingieExample();
$SubjectSpecified = new ThingieExample("this would fall through");