 php      . 
  
<?php 
$q="Helloy world"; 
print $q; 
exit; 
?> 
   $q  "Helloy world" 
  "$q" -  , 
"="   , 
    "Helloy world". 
    " $q   "Helloy world", 
    $q        "exit" 
         Helloy world ". 
  php   ,  
<?php 
$q="Helloy world"; 
$w=$q; 
print $w; 
exit; 
?> 
      $w       $q.