select.php

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<?php
if (isset($vars['class'])) {
    $vars['class'] = "elgg-input-dropdown {$vars['class']}";
} else {
    $vars['class'] = "elgg-input-dropdown";
}

$defaults = array(
    'disabled' => false,
    'value' => '',
    'options_values' => array(),
    'options' => array(),
);

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

$options_values = $vars['options_values'];
unset($vars['options_values']);

$options = $vars['options'];
unset($vars['options']);

$value = is_array($vars['value']) ? $vars['value'] : array($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($vars['name'])) {
    if (substr($vars['name'], -2) != '[]') {
        $vars['name'] = $vars['name'] . '[]';
    }
}

?>
<select <?php echo elgg_format_attributes($vars); ?>>
<?php

if ($options_values) {
    foreach ($options_values as $opt_value => $option) {

        $option_attrs = elgg_format_attributes(array(
            'value' => $opt_value,
            'selected' => in_array((string)$opt_value, $value),
        ));

        echo "<option $option_attrs>$option</option>";
    }
} else {
    if (is_array($options)) {
        foreach ($options as $option) {

            $option_attrs = elgg_format_attributes(array(
                'selected' => in_array((string)$option, $value)
            ));

            echo "<option $option_attrs>$option</option>";
        }
    }
}
?>
</select>