access.php

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<?php
// bail if set to a unusable value
if (isset($vars['options_values'])) {
    if (!is_array($vars['options_values']) || empty($vars['options_values'])) {
        return;
    }
}

$vars['class'] = elgg_extract_class($vars, 'elgg-input-access');

// this will be passed to plugin hooks ['access:collections:write', 'user'] and ['default', 'access']
$params = [];

$keys = [
    'entity' => null,
    'entity_type' => null,
    'entity_subtype' => null,
    'container_guid' => null,
    'purpose' => 'read',
];
foreach ($keys as $key => $default_value) {
    $params[$key] = elgg_extract($key, $vars, $default_value);
    unset($vars[$key]);
}

/* @var ElggEntity $entity */
$entity = $params['entity'];

if ($entity) {
    $params['value'] = $entity->access_id;
    $params['entity_type'] = $entity->type;
    $params['entity_subtype'] = $entity->getSubtype();
    $params['container_guid'] = $entity->container_guid;
}

$container = elgg_get_page_owner_entity();
if (!$params['container_guid'] && $container) {
    $params['container_guid'] = $container->guid;
}

// don't call elgg_get_default_access() unless we need it
$add_missing_value = true;
if (!isset($vars['value']) || $vars['value'] == ACCESS_DEFAULT) {
    if ($entity) {
        $vars['value'] = $entity->access_id;
    } else if (empty($vars['options_values']) || !is_array($vars['options_values'])) {
        $vars['value'] = elgg_get_default_access(null, $params);
        
        // if default value is not present in the options we should not add it
        $add_missing_value = false;
    } else {
        $options_values_ids = array_keys(elgg_extract('options_values', $vars));
        $vars['value'] = $options_values_ids[0];
    }
}

$params['value'] = elgg_extract('value', $vars);

// don't call elgg_get_write_access_array() unless we need it
if (!isset($vars['options_values'])) {
    $vars['options_values'] = elgg_get_write_access_array(0, false, $params);
}

if (!isset($vars['disabled'])) {
    $vars['disabled'] = false;
}

// if access is set to a value not present in the available options, add the option
if ($add_missing_value && !isset($vars['options_values'][$vars['value']])) {
    $vars['options_values'][$vars['value']] = elgg_get_readable_access_level($vars['value']);
}

echo elgg_view('input/select', $vars);