Conditionals · Lesson 4 of 6

Nested Conditions

Nest decisions when one check depends on another.

Lesson

Nested if statements express a decision that depends on an earlier condition. Avoid deep nesting by returning early from functions or combining related boolean checks when that improves clarity. Validate the data before making a decision so every branch has well-defined inputs. Here the second check is meaningful only after the user is known to be signed in. Further guidance Test each branch with a normal value, a boundary value, and an unexpected value. Order range checks from specific to broad, make the fallback behavior intentional, and keep related decisions readable. A condition should use validated data rather than an untrusted request value directly. Practice task: Create a fresh example for Nested Conditions. Predict the result before running it, then change one input and explain why the result changes. Test a normal case and one boundary or invalid case where it applies. Compare your output with the example and note one rule you would use in a real project.

Code examples

Nested Conditions

PHP

$signedIn = true;
$isAdmin = false;
if ($signedIn) {
    echo $isAdmin ? 'Admin area' : 'Member area';
} else {
    echo 'Sign in required';
}

Expected output

Member area

Key points

Nest decisions when one check depends on another.
Test boundary cases for every conditional branch.
Keep fallback behavior explicit and use validated values.

Your learning progress

Finish this lesson

Optional practice

PHP playground

This site does not execute learner-provided PHP code. Connect a secured PHP sandbox service before enabling code execution.

Execution is disabled. No code is sent to a server.