form.php

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<?php
elgg_require_js('input/form');

$defaults = [
    'method' => 'post',
    'disable_security' => false,
];

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

$vars['class'] = elgg_extract_class($vars, 'elgg-form');
if (elgg_extract('prevent_double_submit', $vars, true)) {
    $vars['class'][] = 'elgg-form-prevent-double-submit';
}

$vars['action'] = elgg_normalize_url($vars['action']);
$vars['method'] = strtolower($vars['method']);

$ignore_empty_body = (bool) elgg_extract('ignore_empty_body', $vars, true);
unset($vars['ignore_empty_body']);

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

if (!$ignore_empty_body && empty($body)) {
    return;
}

// Generate a security header
if (!$vars['disable_security']) {
    $body = elgg_view('input/securitytoken') . $body;
}

unset($vars['disable_security']);
unset($vars['action_name']);

echo elgg_format_element('form', $vars, "<fieldset>$body</fieldset>");