fieldset.php

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

$align = elgg_extract('align', $vars, 'vertical');
unset($vars['align']);
$vars['class'][] = "elgg-fieldset-{$align}";

$justify = elgg_extract('justify', $vars);
unset($vars['justify']);
if (!empty($justify)) {
    $vars['class'][] = "elgg-justify-{$justify}";
}

$fieldset_vars = [];
$legend = elgg_extract('legend', $vars, '');
unset($vars['legend']);
if (!empty($legend)) {
    $fieldset_vars['class'][] = 'elgg-fieldset-has-legend';
    $legend = elgg_format_element('legend', [], $legend);
}

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

$fieldset = '';
foreach ($fields as $field) {
    $fieldset .= elgg_view_field($field);
}

unset($vars['name']); // name isn't allowed on a DIV, but is commonly supplied to input views

$fieldset = elgg_format_element('div', $vars, $fieldset);
echo elgg_format_element('fieldset', $fieldset_vars, $legend . $fieldset);