A simple singleton registry store inside an function that provides public read/write access to it's datastore

registry.php

<?php

function o($key = null, $value = null) {
	
	static $registry;

	if( ! $key) {
		return $registry;
	}

	if(is_array($key)) {
		return $registry = $key;
	}

	if($value) {
		return $registry[$key] = $value;
	}

	if(isset($registry[$key])) {
		return $registry[$key];
	}
}

I added this to the list of 140 bytes because of:

function o($k=null,$v=null){static $r;if(!$k) return $r;if(is_array($k))return $r=$k;if($v)return $r[$k]=$v;if(isset($r[$k]))return $r[$k];}