Selecting and checking items from HTML menus

This code allows you to pass in an HTML menu (select, radio, or checkbox) along with a single choice or an array of choices to be selected. The choice(s) should be contained literally in the value attribute.

This is handy for making persistent forms without polluting the HTML with PHP logic. For example, you could initialize all your menus to have nothing selected and then pass in GET or POST variables in case the form was not accepted, easily making form selections persistent.

/**
 * For select menus.
 */
function select_from_menu($menu,$choices,$deselect=true) {
  if ($deselect) $menu = preg_replace('/ selected(="selected")?/','',$menu);
  if(!is_array($choices)) {
    $menu = preg_replace('/(value="'.preg_quote($choices).'")/',"$1 selected=\"selected\"",$menu);
  } else foreach($choices as $value) {
    $menu = preg_replace('/(value="'.preg_quote($value).'")/',"$1 selected=\"selected\"",$menu);
  }
  
  return $menu;
}

/**
 * For radio buttons and checkboxes.
 */
function check_from_menu($menu,$choices,$deselect=true) {
  if ($deselect) $menu = preg_replace('/ checked(="checked")?/','',$menu);
  if(!is_array($choices)) {
    $menu = preg_replace('/(value="'.preg_quote($choices).'")/',"$1 checked=\"checked\"",$menu);
  } else foreach($choices as $value) {
    $menu = preg_replace('/(value="'.preg_quote($value).'")/',"$1 checked=\"checked\"",$menu);
  }

  return $menu;
}

Pretty darn good Email validator

This regular expression was written by a friend of mine according to the email spec RFC2822. It should be near 100% coverage of email addresses assuming no leading or trailing whitespace, and no internal linebreaks (you might try 's' at the end to remedy the line break thing but no guarantees).

/^[-^!#$%&'*+\/=?`{|}~.\w]+@[a-zA-Z0-9]([-a-zA-Z0-9]*[a-zA-Z0-9])*(\.[a-zA-Z0-9]([-a-zA-Z0-9]*[a-zA-Z0-9])*)+$/