How can you declare a PHP class property?

To declare a PHP class property, you specify its visibility (such as public, protected, or private) followed by the variable name. This approach allows you to define the scope and accessibility of the property within the class. For example:

class Example {
    public $propertyName;
}

In this declaration, "public" indicates that any code can access this property, while "propertyName" is the name of the variable within that class. This standard structure is essential for properly setting up properties in PHP objects, ensuring they are appropriately encapsulated according to object-oriented principles.

The other methods mentioned in the options refer to different aspects of working with class properties. Defining a type is part of type hinting or type declarations, which is different from the property declaration itself. Initializing a property within a method or declaring it within the constructor are not considered direct declarations of the property; rather, these are actions taken to assign a value or create an instance of the property after it has already been declared.