Quick Reference for PHP

Redirect with PHP

See also: PHP Function Reference

 <?
   header('Location: http://members.robotz.com/');
 ?>

Read Query String

 <?
   $qString = $_SERVER['QUERY_STRING'];
   $qString = preg_replace('#[^a-zA-Z0-9_-]#', '', $qString);
   print "QUERYSTRING= $qString<BR>";
   if ($qString == "") $qString = "home";
   if ($qString == "home") {
     ?><i>Viewing the HOME PAGE</i></a> <?
   } elseif ($qString == "other") {
     ?><i>Viewing some other page</i></a> <?
   }

The line with preg_replace protects against known query string exploits. The null assignment could be done better, however, the example is for syntax purposes.

Switch is the Equivalent of Case

<?
switch ($i) {
    case 0:
        echo "i equals 0";
        break;
    case 1:
        echo "i equals 1";
        break;
    case 2:
        echo "i equals 2";
        break;
    default:
       echo "i is not equal to 0, 1 or 2";
}
?>