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

The potential pitfalls of using isset() and empty() functions in PHP when handling form data is that they can lead to unexpected behavior when dealing with checkboxes or select elements that may not be set or have empty values. To solve this issue, it's better to use the isset() function to check if the key exists in the $_POST array and then explicitly check if the value is not empty using a more specific condition. 

if(isset($_POST['checkbox']) && $_POST['checkbox'] !== ''){
    // Checkbox is checked
} else {
    // Checkbox is not checked
}

Keywords

isset empty form data validation error handling

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