custom tag personalizzati

[oly1982]

Quanto dice alcio è verissimo... e molto diffuso in php.
Tratta dal form helper di CI:

function form_dropdown($name = '', $options = array(), $selected = array(), $extra = '')
    {
        if ( ! is_array($selected))
        {
            $selected = array($selected);
        }

        // If no selected state was submitted we will attempt to set it automatically
        if (count($selected) === 0)
        {
            // If the form name appears in the $_POST array we have a winner!
            if (isset($_POST[$name]))
            {
                $selected = array($_POST[$name]);
            }
        }

        if ($extra != '') $extra = ' '.$extra;

        $multiple = (count($selected) > 1 && strpos($extra, 'multiple') === FALSE) ? ' multiple="multiple"' : '';

        $form = '<select name="'.$name.'"'.$extra.$multiple.">\n";

        foreach ($options as $key => $val)
        {
            $key = (string) $key;

            if (is_array($val) && ! empty($val))
            {
                $form .= '<optgroup label="'.$key.'">'."\n";

                foreach ($val as $optgroup_key => $optgroup_val)
                {
                    $sel = (in_array($optgroup_key, $selected)) ? ' selected="selected"' : '';

                    $form .= '<option value="'.$optgroup_key.'"'.$sel.'>'.(string) $optgroup_val."</option>\n";
                }

                $form .= '</optgroup>'."\n";
            }
            else
            {
                $sel = (in_array($key, $selected)) ? ' selected="selected"' : '';

                $form .= '<option value="'.$key.'"'.$sel.'>'.(string) $val."</option>\n";
            }
        }

        $form .= '</select>';

        return $form;
    }

/*esempio di utilizzo*/
$array_select_option = array(
1 => 'html',
2 => 'php',
3=> 'css'
);
echo form_dropdown('name_my_select', $array_select_option);