Conditionals · Lesson 3 of 6

elseif

Test several mutually exclusive conditions in order.

Lesson

An elseif branch is considered only when earlier conditions were false. Order ranges from most specific to least specific so a broad condition does not hide a more specific case. Include a final else when every remaining value needs a deliberate default. The example maps a validated score to a grade band. 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 elseif. 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

elseif

PHP

$score = 84;
if ($score >= 90) {
    echo 'A';
} elseif ($score >= 80) {
    echo 'B';
} else {
    echo 'Keep practicing';
}

Expected output

Key points

Test several mutually exclusive conditions in order.
Test boundary cases for every conditional branch.
Keep fallback behavior explicit and use validated values.

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