What are the potential pitfalls of using empty() and isset() functions in PHP?

Using empty() and isset() functions in PHP can lead to potential pitfalls if not used carefully. The empty() function considers variables with a value of 0 or "0" as empty, which may not be the desired behavior. On the other hand, the isset() function may return true for variables that are set to null. To avoid these pitfalls, it's recommended to use strict comparison operators (=== and !==) to accurately check for empty values or set variables.

// Example of using strict comparison operators to check for empty values
if ($variable !== '' && $variable !== null) {
    // Variable is not empty
} else {
    // Variable is empty
}