How can PHP code be structured to maintain and display previously selected checkbox values on page reload?

To maintain and display previously selected checkbox values on page reload, you can use the isset() function to check if the checkbox was selected and set its "checked" attribute accordingly. This can be done by storing the selected checkbox values in an array and comparing them with the checkbox values when the page is reloaded. 

<?php
// Define an array to store selected checkbox values
$selectedValues = [];

// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Store selected checkbox values in the array
    $selectedValues = isset($_POST['checkbox']) ? $_POST['checkbox'] : [];
}

// Display checkboxes with previously selected values
$checkboxValues = ['Option 1', 'Option 2', 'Option 3'];

foreach ($checkboxValues as $value) {
    $checked = in_array($value, $selectedValues) ? 'checked' : '';
    echo '<input type="checkbox" name="checkbox[]" value="' . $value . '" ' . $checked . '> ' . $value . '<br>';
}
?>

Keywords

PHP checkbox values session reload

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