[PHP] how to redirect from one page to an other page in PHP ?

[Iguider]

Hi

please how to redirect from one page to an onther in php ?  ( like it is in ASp : 
redirect("../index.asp")
exemple 
switch (condition1) {
case "1";
   go to page page1.php;
case "2";
   go to page page2.php;
}

thanks in advance