<?php
	class MyClass {
		const DB_NAME = "MyDb";
		const HOST = "localhost";
		const USER = "abcdef";
		const PASSWORD = "ghijklmn";
		protected static $MyString;

		public static function getString() {
			if (self::$MyString == null)
				self::$MyString = file_get_contents('log.txt');
			return self::$MyString;
		}
	}

	echo MyClass::getString();
?>