What are common mistakes beginners make when trying to implement conditional logic within PHP functions, and how can they improve their approach?

Common mistakes beginners make when implementing conditional logic within PHP functions include not properly using comparison operators, forgetting to include necessary parentheses for complex conditions, and not considering the order of conditions when using multiple if statements. To improve their approach, beginners should carefully review the syntax of comparison operators, double-check the placement of parentheses in complex conditions, and organize their if statements in a logical order.

// Incorrect implementation
function checkAge($age) {
    if $age >= 18 {
        return "You are an adult.";
    }
    else if $age < 18 {
        return "You are a minor.";
    }
}

// Corrected implementation
function checkAge($age) {
    if ($age >= 18) {
        return "You are an adult.";
    }
    else {
        return "You are a minor.";
    }
}