save.php

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<?php
if (!elgg_is_logged_in()) {
    return;
}

elgg_require_js('elgg/comments');

$entity = elgg_extract('entity', $vars);
/* @var ElggEntity $entity */

$comment = elgg_extract('comment', $vars);
/* @var ElggComment $comment */

$inline = (bool) elgg_extract('inline', $vars, false);

if ($entity) {
    echo elgg_view('input/hidden', [
        'name' => 'entity_guid',
        'value' => $entity->guid,
    ]);
}

$comment_text = '';
$footer = '';
if ($comment && $comment->canEdit()) {
    echo elgg_view('input/hidden', [
        'name' => 'comment_guid',
        'value' => $comment->guid,
    ]);
    $comment_label  = elgg_echo("generic_comments:edit");
    $footer .= elgg_view('input/submit', ['value' => elgg_echo('save')]);
    $comment_text = $comment->description;
} else {
    $comment_label  = elgg_echo("generic_comments:add");
    $footer .= elgg_view('input/submit', ['value' => elgg_echo('comment')]);
}

if ($inline) {
    $form = elgg_view('input/text', [
        'name' => 'generic_comment',
        'value' => $comment_text,
        'required' => true,
    ]);
    
    $form .= $footer;
    echo elgg_format_element('div', [
        'class' => 'elgg-level',
    ], $form);
} else {
    echo elgg_view_field([
        '#type' => 'longtext',
        '#label' => $comment_label,
        'name' => 'generic_comment',
        'value' => $comment_text,
        'required' => true,
        'editor_type' => 'simple',
    ]);
    
    if ($comment) {
        $footer .= elgg_view('input/button', [
            'value' => elgg_echo('cancel'),
            'class' => 'elgg-button-cancel mlm',
            'href' => $entity ? $entity->getURL() : '#',
        ]);
    }
    
    elgg_set_form_footer($footer);
}