How can PHP beginners ensure proper error handling and debugging techniques when encountering issues like undefined variables?

When encountering issues like undefined variables in PHP, beginners can ensure proper error handling and debugging techniques by using the isset() function to check if a variable is set before using it. This helps prevent errors and allows for more controlled handling of undefined variables.

// Check if the variable is set before using it
if(isset($variable)){
    // Use the variable here
    echo $variable;
} else {
    // Handle the case when the variable is not set
    echo "Variable is not set";
}