checkbox.php

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<?php
$vars['class'] = elgg_extract_class($vars, 'elgg-input-checkbox');

$defaults = [
    'default' => 0,
    'type' => 'checkbox',
];

$vars = array_merge($defaults, $vars);

$default = elgg_extract('default', $vars);
unset($vars['default']);

if (isset($vars['name']) && $default !== false) {
    echo elgg_view('input/hidden', [
        'name' => elgg_extract('name', $vars),
        'value' => $default,
        'disabled' => elgg_extract('disabled', $vars),
    ]);
}

$label = elgg_extract('label', $vars, false);
$label_class = elgg_extract_class($vars, ['elgg-input-single-checkbox'], 'label_class');
unset($vars['label']);
unset($vars['label_class']);

$switch = elgg_extract('switch', $vars, false);
unset($vars['switch']);

if ($switch) {
    $vars['class'][] = 'hidden';
}

$input = elgg_format_element('input', $vars);
if ($switch) {
    $input .= elgg_format_element('span', ['class' => 'elgg-input-checkbox-switch']);
    
    if (empty($label)) {
        $label = '&nbsp;';
    }
}

if (!empty($label)) {
    $html_tag = elgg_extract('label_tag', $vars, 'label', false);
    if ($switch && ($html_tag !== 'label')) {
        $input = elgg_format_element('label', [], $input);
    }
    
    echo elgg_format_element($html_tag, ['class' => $label_class], "$input $label");
    return;
}

echo $input;