checkbox.php

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

$defaults = array(
    'default' => 0,
    'disabled' => false,
    'type' => 'checkbox'
);

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

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

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

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

$input = elgg_format_element('input', $vars);

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