 php       ( )      
 ,   ,         , 
 :

<?php
function messag()
{
    $q=1;
    $w=2;
    if($q<$w)
    {
        print "Helloy world!";
    }
    else
    {
        print " !";
    }
}
messag();
exit;
?>

      :

    $q=1;
    $w=2;
    if($q<$w)
    {
        print "Helloy world!";
    }
    else
    {
        print " !";

      messag()    , 
            
   -  , 
      . 
   function (   )      
 { }.