nav.php

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<?php
// has a refresh button been requested
$refresh = '';
if (elgg_extract('refresh', $vars)) {
    $refresh = elgg_view('output/url', [
        'text' => elgg_echo('install:refresh'),
        'href' => elgg_get_current_url(),
        'class' => ['elgg-button', 'elgg-button-action'],
    ]);
}

// create next button and selectively disable
$next_options = [
    'text' => elgg_echo('install:next'),
    'href' => elgg_get_site_url() . "install.php?step={$vars['next_step']}",
    'class' => ['elgg-button', 'elgg-button-submit'],
];

if (elgg_extract('advance', $vars) === false) {
    // disable the next button
    $next_options['class'][] = 'elgg-state-disabled';
    $next_options['href'] = false;
}

$next = elgg_view('output/url', $next_options);

echo elgg_format_element('div', ['class' => 'elgg-install-nav'], $refresh . $next);