Operations on classes and objects in php
$p1 = new Person('michael');//Pass the name to the constructor __construct of the Person class
echo($p1->name);//Get the public instance attribute name of object p1 (note there is no $)
$p1->speak();//Call the instance method speak
of object p1
echo(Person::$sex);//Get the class variable (static $sex)
echo(Person::sex);//Get the constants in the class (not static const, no static const. Only class variables and no class constants.)
Person::run();//Call class method (or static method static function)
Summary:
Used for object instance operations ->
For class operations::

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