What is the difference between using a radio button and a checkbox in PHP forms?

Radio buttons allow users to select only one option from a list, while checkboxes allow users to select multiple options. When creating PHP forms, you need to handle radio button and checkbox inputs differently in order to process the user's selections correctly. You can use the isset() function in PHP to check if a radio button or checkbox has been selected, and then retrieve the selected value from the form data. 

<form method="post">
    <input type="radio" name="gender" value="male"> Male<br>
    <input type="radio" name="gender" value="female"> Female<br>
    <input type="radio" name="gender" value="other"> Other<br>
    
    <input type="checkbox" name="interests[]" value="sports"> Sports<br>
    <input type="checkbox" name="interests[]" value="music"> Music<br>
    <input type="checkbox" name="interests[]" value="movies"> Movies<br>
    
    <input type="submit" name="submit" value="Submit">
</form>

<?php
if(isset($_POST['submit'])){
    $gender = $_POST['gender'];
    $interests = isset($_POST['interests']) ? $_POST['interests'] : [];
    
    echo "Selected gender: " . $gender . "<br>";
    echo "Selected interests: " . implode(", ", $interests);
}
?>

Keywords

radio button checkbox PHP forms user input form validation

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