checkboxes.php

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<?php
$defaults = [
    'align' => 'vertical',
    'value' => [],
    'default' => 0,
    'disabled' => false,
    'options' => [],
    'name' => '',
];

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

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

$input_options = [];

foreach ($options_values as $key => $value) {
    if (is_array($value)) {
        $key = elgg_extract('text', $value, $key);
    } else {
        $value = [
            'text' => $value,
            'value' => $key,
        ];
    }
    $input_options[$key] = $value;
}

// turn options into options_values
$options = elgg_extract('options', $vars);
unset($vars['options']);
if (!empty($options) && empty($input_options)) {
    foreach ($options as $label => $value) {
        $input_options[$label] = ['value' => $value];
    }
}

if (empty($input_options)) {
    return;
}

$list_class = elgg_extract_class($vars, [
    'elgg-input-checkboxes',
    "elgg-{$vars['align']}",
]);
unset($vars['class']);

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

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

// 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' => elgg_extract('name', $vars),
        'value' => elgg_extract('default', $vars),
        'disabled' => elgg_extract('disabled', $vars),
    ]);
}

// prepare checkbox vars
$input_vars = $vars;
$input_vars['default'] = false;
if (elgg_extract('name', $vars)) {
    $input_vars['name'] = "{$vars['name']}[]";
}
unset($input_vars['align']);

$checkboxes = '';
foreach ($input_options as $label => $option) {
    $checkbox_input_options = array_merge($input_vars, $option);
    $checkbox_input_options['checked'] = in_array(elgg_strtolower((string) elgg_extract('value', $option)), $values);
    $checkbox_input_options['label'] = elgg_extract('text', $checkbox_input_options, $label);
    unset($checkbox_input_options['text']);

    $input = elgg_view('input/checkbox', $checkbox_input_options);

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

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