Static properties and methods in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a static property in PHP?

A static property belongs to the class itself, not to any object instance. It is shared by all instances of the class.

beginner

How do you access a static property inside a class method?

Use self::$propertyName to access a static property inside the class.

beginner

What is a static method in PHP?

A static method belongs to the class and can be called without creating an object instance.

beginner

How do you call a static method from outside the class?

Use ClassName::methodName() to call a static method without creating an object.

intermediate

Can static methods access non-static properties in PHP?

No, static methods cannot access non-static properties because they do not belong to any object instance.

How do you define a static property in a PHP class?

A Using the <code>const</code> keyword

B Using the <code>static</code> keyword before the property

C Using the <code>public</code> keyword only

D Using the <code>var</code> keyword

Static properties are declared with the static keyword inside the class.

How do you call a static method named show in class Example?

A <code>show()</code>

B <code>Example->show()</code>

C <code>new Example()->show()</code>

D <code>Example::show()</code>

Static methods are called using the class name and double colon: Example::show().

Which keyword is used inside a class to refer to its own static property?

A this

B static

C self

D parent

Inside a class, self::$propertyName accesses static properties.

Can static properties have different values for each object instance?

A No, static properties are shared by all instances

B Yes, each object has its own copy

C Only if declared public

D Only if declared private

Static properties belong to the class, so all instances share the same value.

Which of the following is true about static methods?

A They can be called without creating an object

B They can access $this inside the method

C They must be called on an object instance

D They cannot access static properties

Static methods belong to the class and can be called without creating an object.

Explain what static properties and static methods are in PHP and how they differ from regular properties and methods.

Think about how you can use a property or method without making an object.

Describe how to access a static property and call a static method inside and outside a PHP class.

Remember the special syntax for static members.