What is the best practice for handling variables in PHP to avoid errors like non-existent variables?

When handling variables in PHP, it is important to check if a variable exists before trying to use it to avoid errors like non-existent variables. One way to do this is by using the isset() function to determine if a variable is set and not NULL. By checking the existence of a variable before using it, you can prevent errors and ensure that your code runs smoothly.

// Check if the variable $name is set before using it
if(isset($name)) {
    echo "The name is: " . $name;
} else {
    echo "The variable name is not set.";
}