save.php

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

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

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

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

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

$comment_text = '';
$comment_guid_input = '';
if ($comment && $comment->canEdit()) {
    $entity_guid_input = elgg_view('input/hidden', array(
        'name' => 'comment_guid',
        'value' => $comment->guid,
    ));
    $comment_label  = elgg_echo("generic_comments:edit");
    $submit_input = elgg_view('input/submit', array('value' => elgg_echo('save')));
    $comment_text = $comment->description;
} else {
    $comment_label  = elgg_echo("generic_comments:add");
    $submit_input = elgg_view('input/submit', array('value' => elgg_echo('comment')));
}

$cancel_button = '';
if ($comment) {
    $cancel_button = elgg_view('input/button', array(
        'value' => elgg_echo('cancel'),
        'class' => 'elgg-button-cancel mlm',
        'href' => $entity ? $entity->getURL() : '#',
    ));
}

if ($inline) {
    $comment_input = elgg_view('input/text', array(
        'name' => 'generic_comment',
        'value' => $comment_text,
        'required' => true
    ));

    echo $comment_input . $entity_guid_input . $comment_guid_input . $submit_input;
} else {

    $comment_input = elgg_view('input/longtext', array(
        'name' => 'generic_comment',
        'value' => $comment_text,
        'required' => true
    ));

    echo <<<FORM
<div>
    <label>$comment_label</label>
    $comment_input
</div>
<div class="elgg-foot">
    $comment_guid_input
    $entity_guid_input
    $submit_input $cancel_button
</div>
FORM;
}