select.php

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<?php
$vars['class'] = elgg_extract_class($vars, ['elgg-input-select']);
 
$defaults = [
    'value' => '',
];
 
$vars = array_merge($defaults, $vars);
 
$options_values = [];
 
// turn options into options_values
$options = elgg_extract('options', $vars, []);
unset($vars['options']);
 
foreach ($options as $option) {
    if (is_array($option)) {
        if (!isset($option['value'])) {
            $option['value'] = elgg_extract('text', $option);
        }
    } else {
        $option = [
            'text' => $option,
            'value' => $option,
        ];
    }
 
    $options_values[] = $option;
}
 
// provided options_values trump options
$options_values = elgg_extract('options_values', $vars, $options_values);
unset($vars['options_values']);
 
$normalize_options = function($options) use (&$normalize_options) {
    foreach ($options as $key => $option) {
        if (!is_array($option)) {
            $option = [
                'text' => $option,
                'value' => $key,
            ];
        }
 
        $optgroup = elgg_extract('options', $option);
        if (is_array($optgroup)) {
            $option['options'] = $normalize_options($optgroup);
        }
 
        $options[$key] = $option;
    }
 
    return $options;
};
 
$options_values = $normalize_options($options_values);
 
$value = is_array($vars['value']) ? $vars['value'] : [$vars['value']];
$value = array_map('strval', $value);
unset($vars['value']);
 
$vars['multiple'] = !empty($vars['multiple']);
 
// Add trailing [] to name if multiple is enabled to allow the form to send multiple values
if ($vars['multiple'] && !empty($vars['name']) && is_string($vars['name'])) {
    if (!str_ends_with($vars['name'], '[]')) {
        $vars['name'] = elgg_extract('name', $vars) . '[]';
    }
}
 
$render_option = function($option) use ($value) {
    $opt_value = elgg_extract('value', $option);
 
    $text = elgg_extract('text', $option);
    unset($option['text']);
 
    if (!is_string($text) && !is_numeric($text)) {
        elgg_log('No text defined for input/select option with value "' . $opt_value . '"', \Psr\Log\LogLevel::NOTICE);
    }
 
    if (!isset($option['selected'])) {
        $option['selected'] = isset($opt_value) && in_array((string) $opt_value, $value);
    }
    
    if (!isset($option['title'])) {
        $option['title'] = $text;
    }
 
    return elgg_format_element('option', $option, $text);
};
 
$options_list = '';
 
foreach ($options_values as $option) {
    $options = elgg_extract('options', $option);
 
    if (is_array($options)) {
        $optgroup_attrs = $option;
        unset($optgroup_attrs['options']);
        
        $optgroup = '';
        foreach ($options as $group_option) {
            $optgroup .= $render_option($group_option);
        }
 
        $options_list .= elgg_format_element('optgroup', $optgroup_attrs, $optgroup);
    } else {
        $options_list .= $render_option($option);
    }
}
 
echo elgg_format_element('select', $vars, $options_list);