Protected in Visibility | Inheritance in php | OOP scopes | Object Oriented PHP tutorial
Visibility
The visibility of a property, a method or (as of PHP 7.1.0) a constant can be defined by prefixing the declaration with the keywords public, protected or private. Class members declared public can be accessed everywhere. Members declared protected can be accessed only within the class itself and by inheriting and parent classes. Members declared as private may only be accessed by the class that defines the member.
Property Visibility
Class properties must be defined as public, private, or protected. If declared using var, the property will be defined as public.
Method Visibility
Class methods may be defined as public, private, or protected. Methods declared without any explicit visibility keyword are defined as public.
class
Basic class definitions begin with the keyword class, followed by a class name, followed by a pair of curly braces which enclose the definitions of the properties and methods belonging to the class.
The class name can be any valid label, provided it is not a PHP reserved word. A valid class name starts with a letter or underscore, followed by any number of letters, numbers, or underscores.
A class may contain its own constants, variables (called "properties"), and functions (called "methods").
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