How can a checkbox be defined as 'checked' in PHP to retain the value upon clicking a button?

To retain the value of a checkbox as 'checked' in PHP upon clicking a button, you can use the isset() function to check if the checkbox is selected. If it is selected, you can set a variable to 'checked' and use this variable to display the checkbox as checked. This way, the checkbox will retain its checked state even after clicking the button. 

<?php
$checkbox = ''; // initialize variable

if(isset($_POST['checkbox'])) {
    $checkbox = 'checked'; // set variable to 'checked' if checkbox is selected
}
?>

<input type="checkbox" name="checkbox" <?php echo $checkbox; ?>>
<button type="submit">Submit</button>

Keywords

PHP checkbox checked button value

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