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Linux command tip

whatis command will provide a short description about a command. Eg: whatis ls will give a brief one line description about ls command.

whereis command will show the location of the command in the disk. Eg: whereis man will show you where the man command is stored on the disk.

use clone keyword to implement copy constructor for classes in PHP.

Make a class as final class or methods as final methods to prevent the child class from overriding it or inheriting the class.

Use trait feature when you want to share code across multiple classes.