 #4.
~~~~~

~~~~~
   ?       .    ,   .   : array.     .    ?  ,    Bill, Mike, John, Edward.       PHP-.   .
 I

<?php
//  
/*
 1
 

*/
$bill = "Bill";
$mike = "Mike";
$john = "John";
$edward = "Edward";
//   
//   3
echo $john;
//    - John
//  
?>

 II

<?php
//  
/*
 2
 
  
  3
*/
$array = array('Bill', 'Mike', 'John', 'Edward');
echo $array[3];
//   Edward
//  
?>

    ?          .       3  .    -     John.
     .      array,  ""   .       echo $array[3];    .          Edward. "  John?" -  . .       .  ,      ,         3.
0 - Bill
1 - Mike
2 - John
3 - Edward
      .      ( ) array();.    ,   . :
$nazvanie = array(' ', ' ', ' ....');
    700 .         500.    :
echo $nazvanie[499];
 499,  .
    :
<?php
//  
//   massive
$massive[1] = "Bill";
$massive[20] = "Mike";
$massive[973] = "John";
$massive[74] = "Edward";
//    
echo $massive[973];
//  John
echo "<br />";
echo $massive[20];
//  Mike
echo "<br />";
echo $massive[111];
//   
//  
?>
       massive,        : 973, 20, 111.        111,  .
~~~~~
-  ...   , .