PHP file can not be created

While working with programming languages there are certain file of folder which can not be created ,similarly in php the are some word by which file cant be created

PHP file can not created:

In Microsoft’s Windows operating systems like Windows XP or in Vista we cant create folders with names CON, PRN, AUX, CLOCK$, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9 directly from GUI. This is because, DOS device names are reserved words, and cannot be used as folder or file names.