#PHP 変数のSet/Get用関数

vars.php

<?php

function vars($keys = null, $value = null)
{
	static $values = array(), $buffer = array();

	if (empty($keys)) {
		return $values;
	}

	elseif (is_string($keys)) {
		//$keys = strtolower($keys);

		if (null !== $value) {
			if (false !== strpos($keys, '.')) {
				$ex = explode('.', $keys);
				$current = $ex[0];

				$data = array();
				$ref =& $data;
				foreach ($ex as $key) {
					$ref =& $ref[$key];
				}
				$ref = $value;
				unset($ref);
				
				$values[$current] = array_replace_recursive($values[$current], $data[$current]);
				return $buffer[$keys] = $value;
			} else {
				$values[$keys] = $value;
				return $value;
			}
		} elseif (!empty($values[$keys])) {
			return $values[$keys];
		} elseif (!empty($buffer[$keys])) {
			return $buffer[$keys];
		} else {
			$value = $values;
			foreach (explode('.', $keys) as $key) {
				if (!array_key_exists($key, $value)) {
					return null;
				}
				$value = $value[$key];
			}

			return $buffer[$keys] = $value;
		}
	}
}