What are some differences between isset() and empty() functions in PHP?

What are some differences between isset() and empty() functions in PHP?

The isset() function in PHP is used to determine if a variable is set and is not NULL. It returns true if the variable exists and has a value other than NULL. On the other hand, the empty() function checks if a variable is empty. It will return true if the variable is not set, or if it is set to a value that is considered empty, such as an empty string, 0, or NULL.

Therefore, the main difference between isset() and empty() functions is that isset() only checks if a variable exists and is not NULL, while empty() checks if the variable is empty or not set at all.

Understanding the distinctions between isset() and empty() is crucial for handling variables effectively in PHP programming.