What are the best practices for using logical operators in PHP?

When using logical operators in PHP, it is important to understand their precedence and associativity to avoid unexpected results. It is recommended to use parentheses to explicitly define the order of operations when combining multiple logical operators in a single expression. Additionally, using clear and concise variable names can help improve readability and maintainability of the code.

// Example of using parentheses to clarify the order of operations
$age = 25;
$income = 50000;

if (($age >= 18 && $age <= 65) || $income > 40000) {
    echo "You are eligible for the discount.";
} else {
    echo "You are not eligible for the discount.";
}