label.php

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<?php
$label = elgg_extract('label', $vars, '');
$id = elgg_extract('id', $vars);
$required = elgg_extract('required', $vars);

if (!$label) {
    return;
}

if ($required) {
    $indicator = elgg_extract('required_indicator', $vars);
    if (!isset($indicator)) {
        $indicator = elgg_format_element([
            '#tag_name' => 'span',
            'title' => elgg_echo('field:required'),
            'class' => 'elgg-required-indicator',
            '#text' => "&ast;",
        ]);
    }
    if ($indicator) {
        $label .= $indicator;
    }
}

echo elgg_format_element('label', [
    'for' => $id,
    'class' => 'elgg-field-label'
], $label);