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27. extends(繼承)28. static
The static keyword lets you use a class' property or method without having to create an instance of that class. It works like this:
class Person {
public static $isAlive = "Yep!"
public static function greet() {
echo "Hello there!";
}
}
echo Person::$isAlive;/
/ prints "Yep!"
Person::greet();
// prints "Hello there!"