What are common pitfalls when using radio buttons in PHP forms?

Common pitfalls when using radio buttons in PHP forms include not setting a default value, not properly handling the form submission, and not validating the user input. To solve these issues, always set a default value for the radio buttons, handle the form submission using PHP to process the selected value, and validate the input to ensure it meets the required criteria. 

<form method="post" action="">
    <input type="radio" name="gender" value="male" <?php if(isset($_POST['gender']) && $_POST['gender'] == 'male') echo 'checked'; ?>> Male
    <input type="radio" name="gender" value="female" <?php if(isset($_POST['gender']) && $_POST['gender'] == 'female') echo 'checked'; ?>> Female
    <input type="submit" name="submit" value="Submit">
</form>

<?php
if(isset($_POST['submit'])){
    $gender = $_POST['gender'];
    
    // Process the selected gender value
    // Add validation logic here
}
?>

Keywords

radio buttons PHP forms validation isset empty

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