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Booleans

Part of the Fundamentals section of Coddy's PHP journey — lesson 8 of 71.

Boolean variables can only hold one of two possible values: true or false.

Note that these values are case-sensitive, meaning they must be lowercased.

Here is an example of assigning a bool value to a variable:

$variable_true = true;
$variable_false = false;

In the above, two variables named variable_true and variable_false are initialized, with the values true and false respectively.

Booleans are the building blocks for creating logic in the programs we write. We have a whole chapter about logic and conditions.

Cheat sheet

Boolean variables hold one of two values: true or false (case-sensitive, must be lowercased).

$variable_true = true;
$variable_false = false;

Try it yourself

This lesson doesn't include a code challenge.

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This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction to PHP

The PHP LanguageHello World!Tags and StatementsCommentsThe new line

4Comparison & Logical Operators

Comparison OperatorsEquality & IdentityLogical Operators Part 1Logical Operators Part 2Recap - Simple Logic

7Arrays Part 2 - Associative

Intro to Associative ArraysAccessing Values by KeyModifying Values by KeyAdding New Key-Value PairsCheck if Key ExistsRecap - Key-Value Data Store

10Functions

Declaring & Calling FunctionsFunction ParametersReturning ValuesDefault Parameter ValuesType Declarations for ParamsReturn Type DeclarationsVariable ScopeRecap - Creating Reusable Code

2Variables and Data Types

NumbersStrings and QuotesBooleansNaming ConventionsRecap - Variable InitEmpty VariablesString ConcatenationGetting User InputCast to Different Types

5Conditional Logic

If StatementIf - ElseThe Ternary OperatorNull Coalescing OperatorSwitch StatementRecap - Making Decisions

8Loops

For LoopWhile LoopForeach LoopLooping with Keys and ValuesBreak StatementContinue StatementRecap - Iterating Over Data

11Final Challenges

Challenge - Factorial CalcChallenge - Longest WordChallenge - Vowel Counter

3Basic Operators

Arithmetic OperatorsModulo OperatorExponentiation OperatorCombined AssignmentIncrement/DecrementOperator PrecedenceRecap - Simple CalculationsString Operators

6Arrays Part 1 - Indexed

Introduction to ArraysCreating Indexed ArraysAccessing Elements by IndexModifying Elements by IndexArray Size with CountAdding Elements to an ArrayRecap - Managing a Simple List

9Project: Simple To-Do List

Project Overview & DataAdding a New TaskProject lessonDisplaying All TasksProject lessonMarking a Task as CompleteProject lessonRemoving a TaskProject lessonFiltering by Completion StatusProject lessonHandling Empty List ScenariosProject lesson