Static properties and methods in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the static property inside the class.

PHP

<?php
class Counter {
    public static $count = 0;
    public static function increment() {
        self::[1]++;
    }
}
Counter::increment();
echo Counter::$count;

Drag options to blanks, or click blank then click option'

Athis->count

Bself::$count

Ccount

D$count

Attempts:

3 left

💡 Hint

Common Mistakes

Using count (without $) after self:: treats it as a constant, causing an error.

Using this->count inside static method is invalid.

Inside the class, static properties are accessed with self::$propertyName. The blank completes self::$count++.

2fill in blank

medium

Complete the code to call the static method from outside the class.

PHP

<?php
class Logger {
    public static function log($msg) {
        echo $msg;
    }
}
Logger::[1]('Hello World');

Drag options to blanks, or click blank then click option'

Alog

Bwrite

Cecho

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using print or echo as method names causes errors.

Trying to call method with -> instead of ::.

Static methods are called using ClassName::methodName(). Here, the method is named log, so Logger::log('Hello World') is correct.

3fill in blank

hard

Fix the error in accessing the static property inside the static method.

PHP

<?php
class User {
    public static $count = 0;
    public static function addUser() {
        [1]++;
    }
}
User::addUser();
echo User::$count;

Drag options to blanks, or click blank then click option'

Aself::$count

B$count

Cthis->count

DUser->count

Attempts:

3 left

💡 Hint

Common Mistakes

Using $count without self:: causes undefined variable error.

Using this->count inside static method causes error.

Inside static methods, static properties must be accessed with self::$propertyName. Using $count or this->count causes errors.

4fill in blank

hard

Fill both blanks to create a static method that returns the static property value.

PHP

<?php
class Config {
    public static $version = '1.0';
    public static function getVersion() {
        return [1]::[2];
    }
}
echo Config::getVersion();

Drag options to blanks, or click blank then click option'

Aself

BConfig

C$version

Dversion

Attempts:

3 left

💡 Hint

Common Mistakes

Using version (without $) after :: treats it as a constant, causing an error.

Using Config::version inside method is allowed but self::$version is preferred.

Inside the class, use self:: to refer to the class itself, and static properties are accessed with self::$propertyName, so self::$version.

5fill in blank

hard

Fill all three blanks to define and use a static property and method that increments and returns the count.

PHP

<?php
class Visitor {
    public static [1] = 0;
    public static function [2]() {
        self::[1]++;
        return self::[1];
    }
}
echo Visitor::[2]();

Drag options to blanks, or click blank then click option'

A$count

Bincrement

Ccount

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using count (without $) in declaration or after self:: causes syntax or constant errors.

Using wrong method name causes call errors.

Static property is declared as public static $count = 0;, so BLANK_1 is '$count'. Static method is increment. Inside method self::$count is used.