What are the potential pitfalls of allowing users to select their own security questions in PHP applications?

Potential pitfalls of allowing users to select their own security questions in PHP applications include the risk of users choosing weak or easily guessable questions, which can compromise the security of their accounts. To mitigate this risk, developers can provide a predefined list of security questions for users to choose from, ensuring that the questions are sufficiently secure. 

// Predefined list of security questions
$securityQuestions = array(
    "What is your mother's maiden name?",
    "What is the name of your first pet?",
    "In what city were you born?",
    "What is your favorite movie?",
);

// Display the predefined security questions for users to choose from
foreach ($securityQuestions as $question) {
    echo "<option value='$question'>$question</option>";
}

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