• Loop statements provide a boolean context
• while
• Loops while boolean is true
• until
• Loops until boolean is true
• Opposite of while
• do
• At least one loop, then depends on while or until

        while ($hungry) {
            $hungry = eat($banana);
        }

        do {
            $answer = get_answer();
            $correct = check($answer);
        } until ($correct);