What is the difference between using isset() and !empty() functions in PHP form handling, and when should each be used?

When handling form data in PHP, isset() checks if a variable is set and not null, while !empty() checks if a variable is set and not empty. isset() is typically used to check if a variable exists, while !empty() is used to check if a variable has a non-empty value. It's important to use isset() when you want to check if a variable exists, and !empty() when you want to check if a variable has a non-empty value. 

// Using isset() to check if a variable exists
if(isset($_POST['username'])){
    $username = $_POST['username'];
}

// Using !empty() to check if a variable has a non-empty value
if(!empty($_POST['email'])){
    $email = $_POST['email'];
}

Keywords

isset !empty PHP form handling comparison

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