What are the potential pitfalls of using checkboxes in PHP forms for selecting entries?

One potential pitfall of using checkboxes in PHP forms for selecting entries is that if the form is submitted without any checkboxes being checked, the corresponding values may not be included in the form data. To solve this issue, you can use hidden input fields with default values for each checkbox so that even if a checkbox is not checked, its value will still be submitted with the form data. 

<form method="post" action="process_form.php">
    <input type="checkbox" name="entry1" value="1">
    <input type="hidden" name="entry1" value="0">
    
    <input type="checkbox" name="entry2" value="1">
    <input type="hidden" name="entry2" value="0">
    
    <input type="submit" value="Submit">
</form>

Keywords

checkboxes PHP forms entries validation errors

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