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

Using isset() incorrectly can lead to undefined variable errors, while using empty() incorrectly can lead to unexpected behavior in your code. To avoid these pitfalls, always check if a variable is set before using it with isset() and use empty() to check if a variable is empty or not. Additionally, make sure to use strict comparisons (===) when checking for empty values to avoid any unexpected type coercion.

// Incorrect usage of isset()
if(isset($variable)){
    echo $variable;
}

// Corrected usage of isset()
if(isset($variable)){
    echo $variable;
}

// Incorrect usage of empty()
if(empty($variable)){
    echo "Variable is empty";
}

// Corrected usage of empty()
if(!empty($variable)){
    echo $variable;
}