What are some best practices for error handling in PHP to avoid notices and warnings like "Undefined variable"?

To avoid notices and warnings like "Undefined variable" in PHP, it is important to always check if a variable is set before using it. This can be done using isset() or empty() functions to determine if a variable has been defined. Additionally, using error_reporting(E_ALL ^ E_NOTICE) can help suppress notices and warnings in your PHP code.

// Check if the variable is set before using it
if(isset($variable)){
    // Use the variable here
} else {
    // Handle the case where the variable is not defined
}