PHP: Calculating the area of a circle - CodeSkill Coding Challenges

✨ Your Task

Given a radius, calculate the area of a circle. Round the result to nearest integer.

✏️ PHP PHP version: 8.1

👉 Press "Run" and check the result below.

Test cases

A circle with a radius of 3.5 should have an area of 38

A circle with a radius of 10 should have an area of 314

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PHP Fundamentals

A set of coding problems that cover the basic syntax and features of the programming language.

1. VariablesComplexity

Defining static variables4 LoC

Defining constants1 LoC

Passing variables by reference3 LoC

Type casting3 LoC

Using variable functions6 LoC

Using variable variable names1 LoC

2. ConstantsComplexity

Magic constants3 LoC

Predefined constants3 LoC

Defining constants1 LoC

3. FunctionsComplexity

Default function argument values3 LoC

Passing variables by reference3 LoC

Using variable functions6 LoC

Variable-length argument lists7 LoC

4. OperatorsComplexity

Using logical operators3 LoC

5. Control structuresComplexity

Defining if...else statements7 LoC

Defining for loops6 LoC

6. ArraysComplexity

Sorting arrays by key9 LoC

7. StringsComplexity

Concatenating strings3 LoC

8. Classes and ObjectsComplexity

Extending classes8 LoC

Defining static class properties3 LoC

Creating class instances4 LoC

Defining constructor methods6 LoC

9. NamespacesComplexity

Defining namespaces6 LoC

10. Regular expressionsComplexity

Matching strings using regular expressions3 LoC

11. Error handlingComplexity

Catching errors8 LoC

Throwing exceptions6 LoC

12. MathComplexity

Calculating the area of a circle3 LoC