PHP manuál píše:
The Scope Resolution Operator :: (also called Paamayim Nekudotayim) or in simpler terms, the double colon, is a token that allows access to static, constant, and overridden properties or methods of a class.
Týmto operátorom sa volajú statické alebo prekryté metódy, alebo konštanty. Tá tvoja metóda nie je statická (tj. nie je spoločná pre všetky inštancie triedy, lebo pracuje s konkrétnymi hodnotami inštancii), takže ju musíš volať operátorom
->.
A. S. Tanenbaum píše:
The terms LF, MF, and HF refer to low, medium, and high frequency, respectively. Clearly, when the names were assigned, nobody expected to go above 10 MHz, so the higher bands were later named the Very, Ultra, Super, Extremely, and Tremendously High Frequency bands. Beyond that there are no names, but Incredibly, Astonishingly, and Prodigiously high frequency (IHF, AHF, and PHF) would sound nice.
ja som toto písal len ako príklad na rýchlo 
