checkboxes.php

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<?php
$defaults = array(
    'align' => 'vertical',
    'value' => array(),
    'default' => 0,
    'disabled' => false,
    'options' => array(),
    'name' => '',
);

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

if (empty($vars['options'])) {
    return;
}

$list_class = elgg_extract_class($vars);
unset($vars['class']);

$list_class[] = 'elgg-input-checkboxes';
$list_class[] = "elgg-{$vars['align']}";

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

if (is_array($vars['value'])) {
    $values = array_map('elgg_strtolower', $vars['value']);
} else {
    $values = array(elgg_strtolower($vars['value']));
}

$input_vars = $vars;
$input_vars['default'] = false;
if ($vars['name']) {
    $input_vars['name'] = "{$vars['name']}[]";
}
unset($input_vars['align']);
unset($input_vars['options']);

// include a default value so if nothing is checked 0 will be passed.
if ($vars['name'] && $vars['default'] !== false) {
    echo elgg_view('input/hidden', ['name' => $vars['name'], 'value' => $vars['default']]);
}

$checkboxes = '';
foreach ($vars['options'] as $label => $value) {
    $input_vars['checked'] = in_array(elgg_strtolower($value), $values);
    $input_vars['value'] = $value;
    $input_vars['label'] = $label;
    
    $input = elgg_view('input/checkbox', $input_vars);

    $checkboxes .= "<li>$input</li>";
}

echo elgg_format_element('ul', ['class' => $list_class, 'id' => $id], $checkboxes);