<?php 
$db = mysql_connect("localhost","root","");
mysql_select_db("banka_manager",$db);

// Создаем случайные имена и фамилии  //
$mas = file('names.txt');//массив файла имен
$fam = file('family.txt');//массив файла фамилий

   for ($i=1;$i<=21;$i++) {
$rand = rand(0, count($mas) - 1);//случайное число 
$rand_fam = rand(0, count($fam) - 1);//случайное число для фамилии
$family = ucfirst(strtolower($fam[$rand_fam]));//регистр букв  Pupkin
$name = $mas[$rand];//находим случайное имя
$fname[] = $name.$family;//$fname[0]='Vasya Pupkin'.....$fname[128]='Vasya Pupkin128'
}
// end // 




// вычисляем рандомные числа  //

$max_tech = 7; // макс. число для технических данных.
$max_psi = 10; // макс. число для психологических данных.
$max_fys = 9; // макс. число для физических данных.
$max_age = 23; // макс. возраст
 for ($i=1;$i<=14;$i++) 
 
 {
  $params[] = rand(1,$max_tech);//массив случайных чисел от 1 до 7 для технических данных
  $psi[] = rand(1,$max_psi); //массив случайных чисел от 1 до 10 для психологических данных
 }
 
 for ($i=1;$i<=7;$i++) 
 
 {
  $fys[] = rand(1,$max_fys);//массив случайных чисел от 1 до 9 для для физических данных.

 }
// end //
// Получаем возраст и харрактер 
  $age= rand(15,$max_age);
  if ($psi[13] > 6 && $psi[7] < 5) {$haract = "Холерик";}
  if ($psi[1] > 6 && $psi[11] < 5) {$haract = "Холерик";}
  if ($psi[1] > 6 && $psi[11] > 5) {$haract = "Сангвинник";}
  if ($psi[1] < 6 && $psi[8] < 5){$haract = "Флегматик";}
  if ($psi[1] > 6 && $psi[8] < 5){$haract = "Меланхолик";}

// end //


// Добавление в базу данных 21 чел-ка


if (!empty($_POST['ok'])){
 
 for ($j=0;$j<=20;$j++) { //Как сделать разные разные значения каждому человеку?

  
	$query = mysql_query("INSERT INTO attributes (name,throwing, long_kick, dribling, over_attack, play_head, free_kick, Mounted_kick, keeping, picking, Pass, penalty, first_tuch, technics, corner, authority, aggression, select_position, Playing_bez_ball, improvisation, intuition, teamplay, concentration, decisionmaking, durability, flatness, self_possession, creation, bravery,endurance, coordination, agility, natural_data, strength, spring_ability, acceleration,age,haract) 
	VALUES ('$fname[$j]','$params[0]','$params[1]','$params[2]','$params[3]','$params[4]','$params[5]','$params[6]','$params[7]','$params[8]','$params[9]','$params[10]','$params[11]','$params[12]','$params[13]','$psi[0]','$psi[1]','$psi[2]','$psi[3]','$psi[4]','$psi[5]','$psi[6]','$psi[7]','$psi[8]','$psi[9]','$psi[10]','$psi[11]','$psi[12]','$psi[13]','$fys[0]','$fys[1]','$fys[2]','$fys[3]','$fys[4]','$fys[5]','$fys[6]','$age','$haract')");
}
header("Location:gen.php");
}
?>
</div>

<form action="" method="post">
<input name="ok" type="submit" value="Сохранить">
</form>
</body>
</html>

CREATE TABLE IF NOT EXISTS `attributes` (
  `id` int(6) NOT NULL AUTO_INCREMENT,
  `name` varchar(450) NOT NULL,
  `throwing` int(2) NOT NULL,
  `long_kick` int(2) NOT NULL,
  `dribling` int(2) NOT NULL,
  `over_attack` int(2) NOT NULL,
  `play_head` int(2) NOT NULL,
  `free_kick` int(2) NOT NULL,
  `Mounted_kick` int(2) NOT NULL,
  `keeping` int(2) NOT NULL,
  `picking` int(2) NOT NULL,
  `Pass` int(2) NOT NULL,
  `penalty` int(2) NOT NULL,
  `first_tuch` int(2) NOT NULL,
  `technics` int(2) NOT NULL,
  `corner` int(2) NOT NULL,
  `authority` int(2) NOT NULL,
  `aggression` int(2) NOT NULL,
  `select_position` int(2) NOT NULL,
  `Playing_bez_ball` int(2) NOT NULL,
  `improvisation` int(2) NOT NULL,
  `intuition` int(2) NOT NULL,
  `teamplay` int(2) NOT NULL,
  `concentration` int(2) NOT NULL,
  `decisionmaking` int(2) NOT NULL,
  `durability` int(2) NOT NULL,
  `flatness` int(2) NOT NULL,
  `self_possession` int(2) NOT NULL,
  `creation` int(2) NOT NULL,
  `bravery` int(2) NOT NULL,
  `endurance` int(2) NOT NULL,
  `coordination` int(2) NOT NULL,
  `agility` int(2) NOT NULL,
  `natural_data` int(2) NOT NULL,
  `strength` int(2) NOT NULL,
  `spring_ability` int(2) NOT NULL,
  `acceleration` int(2) NOT NULL,
  `age` int(2) NOT NULL,
  `haract` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=cp1251 AUTO_INCREMENT=204 ;

if (!empty($_POST['ok'])){
 
for ($j=1;$j<=20;$j++) { //вот тут добавление
for ($i=1;$i<=14;$i++) 
 
 {
  $params[] = rand(1,$max_tech);//массив случайных чисел от 1 до 7 для технических данных
  $psi[] = rand(1,$max_psi); //массив случайных чисел от 1 до 10 для психологических данных
 }

	$query = mysql_query("INSERT INTO attributes (name,throwing, long_kick, dribling, over_attack, play_head, free_kick, Mounted_kick, keeping, picking, Pass, penalty, first_tuch, technics, corner, authority, aggression, select_position, Playing_bez_ball, improvisation, intuition, teamplay, concentration, decisionmaking, durability, flatness, self_possession, creation, bravery,endurance, coordination, agility, natural_data, strength, spring_ability, acceleration,age,haract) 
	VALUES ('$fname[$j]','$params[0]','$params[1]','$params[2]','$params[3]','$params[4]','$params[5]','$params[6]','$params[7]','$params[8]','$params[9]','$params[10]','$params[11]','$params[12]','$params[13]','$psi[0]','$psi[1]','$psi[2]','$psi[3]','$psi[4]','$psi[5]','$psi[6]','$psi[7]','$psi[8]','$psi[9]','$psi[10]','$psi[11]','$psi[12]','$psi[13]','$fys[0]','$fys[1]','$fys[2]','$fys[3]','$fys[4]','$fys[5]','$fys[6]','$age','$haract')");
}
header("Location:gen.php");
}

в этом цикле 
for ($j=1;$j<=20;$j++)
чтобы на каждом витке заносило заново сгенерированые данные 
'$params[0]','$params[1]','$params[2]','$params[3]' и т.д.

for ($j = 0; $i <= 20; $i ++)
{
  $param = rand(1, 7);
  $psi = rand(1, 10);
  $fys = rand(1, 9);

  if ($psi > 6 && $psi < 5) {$haract = "Холерик";}
  if ($psi > 6 && $psi < 5) {$haract = "Холерик";}
  if ($psi > 6 && $psi > 5) {$haract = "Сангвинник";}
  if ($psi < 6 && $psi < 5){$haract = "Флегматик";}
  if ($psi > 6 && $psi < 5){$haract = "Меланхолик";}

  $query =
    "INSERT INTO `attributes` SET
       `name`='" . $mas[array_rand($mas)] . ' ' . ucfirst(strtolower($mas[array_rand($fam)])) . "',
       `throwing`=" . $param . ",
       `long_kick`=" . $param . ",
       `dribling`=" . $param . ",
       `over_attack`=" . $param . ",
       `play_head`=" . $param . ",
       `free_kick`=" . $param . ",
       `Mounted_kick`=" . $param . ",
       `keeping`=" . $param . ",
       `picking`=" . $param . ",
       `Pass`=" . $param . ",
       `penalty`=" . $param . ",
       `first_tuch`=" . $param . ",
       `technics`=" . $param . ",
       `corner`=" . $param . ",
       `authority`=" . $psi . ",
       `aggression`=" . $psi . ",
       `select_position`=" . $psi . ",
       `Playing_bez_ball`=" . $psi . ",
       `improvisation`=" . $psi . ",
       `intuition`=" . $psi . ",
       `teamplay`=" . $psi . ",
       `concentration`=" . $psi . ",
       `decisionmaking`=" . $psi . ",
       `durability`=" . $psi . ",
       `flatness`=" . $psi . ",
       `self_possession`=" . $psi . ",
       `creation`=" . $psi . ",
       `bravery`=" . $psi . ",
       `endurance`=" . $fys . ",
       `coordination`=" . $fys . ",
       `agility`=" . $fys . ",
       `natural_data`=" . $fys . ",
       `strength`=" . $fys . ",
       `spring_ability`=" . $fys . ",
       `acceleration`=" . $fys . ",
       `age`=" . rand(15, 23) . ",
       `haract`='" . $haract . "'";

  mysql_query($query) or die(mysql_error());
}

Warning: array_rand() [function.array-rand]: First argument has to be an array in Z:\home\code\www\gen.php on line 19

$mas = file('names.txt');
$fam = file('family.txt');