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if/elseif/else works as expected. PHP also has an alternative syntax (if: ... endif;) often used in templates.

if ($score >= 90) {
    echo "A";
} elseif ($score >= 80) {
    echo "B";
} else {
    echo "F";
}

Use === and !==, not == and !=. PHP's == does loose comparison with type juggling: "0" == false is true, and "abc" == 0 is true on PHP 7 (PHP 8 changed this one to false). Our grader runs PHP 7.4, so you will observe the PHP 7 behaviour — one more reason to reach for === and never think about it again. Strict comparison checks both type and value.

$score = 87;
$grade = match(true) {
    $score >= 90 => 'A',
    $score >= 80 => 'B',
    default      => 'F',
};

The match expression (PHP 8+) is like switch but returns a value, requires no break, and uses strict (===) comparison.

Grader note: match is PHP 8 syntax, and this course's grader runs PHP 7.4 — pasting the match block above into an exercise produces a parse error. Know it for modern codebases; use if/elseif/else (or switch) in the exercises here.

Typing tip: === is the equals key pressed three times in a row — no spaces between. PHP's === ("identical") compares value AND type, while == ("loose equals") converts types first — 0 == "a" surprises people; 0 === "a" never does.