radio.php

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

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

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

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

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

$list_class = (array) elgg_extract('class', $vars, []);
$list_class[] = 'elgg-input-radios';
$list_class[] = "elgg-{$vars['align']}";

unset($vars['class']);
unset($vars['align']);

$vars['class'] = 'elgg-input-radio';

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

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

$radios = '';
foreach ($options as $label => $option) {

    $vars['checked'] = in_array(elgg_strtolower($option), $value);
    $vars['value'] = $option;

    // handle indexed array where label is not specified
    // @deprecated 1.8 Remove in 1.9
    if (is_integer($label)) {
        elgg_deprecated_notice('$vars[\'options\'] must be an associative array in input/radio', 1.8);
        $label = $option;
    }
    $radio = elgg_format_element('input', $vars);
    $radios .= "<li><label>{$radio}{$label}</label></li>";
}

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