What are some best practices for handling variables with potentially empty values in PHP?

When handling variables with potentially empty values in PHP, it is important to check if the variable is empty before performing any operations on it to avoid errors. One common approach is to use the isset() function to determine if the variable is set and not null. Another method is to use the empty() function to check if the variable is empty or not. Additionally, you can use the ternary operator to provide a default value if the variable is empty.

// Check if the variable is set and not empty
if(isset($variable) && !empty($variable)) {
    // Perform operations on the variable
    echo $variable;
} else {
    echo "Variable is empty";
}

// Using the ternary operator to provide a default value
$variable = isset($variable) ? $variable : "Default Value";
echo $variable;