Select random array generated from while loop

im learning PHP because i made only designs and templates, and i came to an big problem, at least for me. I am making simple "army battle script" where each player has some troops with attack, defense, hp stats, and they battle against each other. Ive made attack player vs player but i am struggling about many entity fight and how to code it. First im calling all my units sended to attack, run it trought the loop and get in array every row/unit Then i made that with enemy units, and in the end, i have a simple simulation script that makes the fight. But the fight isnt working. It doesnt select random unit from the array, it doesnt switch between attacker x defender turns and whats the worse, it only runs with one unit, when that units dies, the script ends and thats it... Can you guys please give me some answer, or way to handle this? I will be so thankfull because i am solving this for few days and i have no clue. Thanks. (i know that the code is ugly, but its just concept...)

    case 'battle_wizard_execute';
                    ?>
                    <table> 
                    <tr><td><h3>Utok</h3></td></tr>
                    <?

                   $query_street = mysql_query("SELECT * FROM game_army_attacks WHERE attack_id = '".$_GET['id']."' ");
                   $row_street = mysql_fetch_assoc($query_street);

                   $query_loc_info = mysql_query("SELECT * FROM game_location_street WHERE street_id = '".$row_street['attack_attacker']."' ");
                   $row_loc_info = mysql_fetch_assoc($query_loc_info);

                   $tilee_info = mysql_num_rows($query_street);
                   if ($tilee_info > 0){ 

   $query_units_info = mysql_query("SELECT * FROM game_army_units_attacking WHERE army_attack = '".$_GET['id']."' ");
   while (($unitsinfo = mysql_fetch_assoc($query_units_info)) != NULL) {
   $query_unit_info = mysql_query("SELECT * FROM game_army_class WHERE army_class_id = '".$unitsinfo['army_class_id']."' ");
   $unit = mysql_fetch_assoc($query_unit_info);
   $unit_attacker = array();

   $unit_attacker[] = array(
        'name' => $unit['army_class_name'],
        'power' => $unitsinfo['army_power'],
        'attack' => $unitsinfo['army_att'],
        'defense' => $unitsinfo['army_def']
    );

   ///// Kolko jednotiek máš tolko krat sa vypise 
   $x = 1;    
   while($x <= $unitsinfo['army_population']) {

   foreach($unit_attacker as $index => $record){    

   ///// Tato cast pusti kod pre kazdu jednu jednotku ktora je v poli
   echo "<tr><td>Jednotka: {$record['name']} ID: {$record['power']} ParentID: {$record['attack']} Title: {$record['defense']}</td></tr>";
   $x++;
} 
}
}   
}  
                 ?>
                    </table>
                    <table> 
                    <tr><td><h3>Utok protivnik</h3></td></tr>
                    <?
   $query_street_def = mysql_query("SELECT * FROM game_army_units WHERE army_street = '".$row_street['attack_defender']."' ");
   $tilee_info_def = mysql_num_rows($query_street_def);
   if ($tilee_info_def > 0){ 

   $query_units_info_def = mysql_query("SELECT * FROM game_army_units WHERE army_street = '".$row_street['attack_defender']."' ");
   while (($unitsinfo_def = mysql_fetch_assoc($query_units_info_def)) != NULL) {
   $query_unit_info_def = mysql_query("SELECT * FROM game_army_class WHERE army_class_id = '".$unitsinfo_def['army_class_id']."' ");
   $unit_def = mysql_fetch_assoc($query_unit_info_def);
   $unit_attacker_def = array();

   $unit_attacker_def[] = array(
        'name' => $unit_def['army_class_name'],
        'power' => $unitsinfo_def['army_power'],
        'attack' => $unitsinfo_def['army_att'],
        'defense' => $unitsinfo_def['army_def']
    );

   ///// Kolko jednotiek máš tolko krat sa vypise 
   $y = 1;    
   while($y <= $unitsinfo_def['army_population']) {

   foreach($unit_attacker_def as $index => $record_def){    

   ///// Tato cast pusti kod pre kazdu jednu jednotku ktora je v poli
   echo "<tr><td>Jednotka: {$record_def['name']} ID: {$record_def['power']} ParentID: {$record_def['attack']} Title: {$record_def['defense']}</td></tr>";
   $y++;
} 
}
}    
} 

$count = 0;    
while ((count($unit_attacker_def) > 0) && (count($unit_attacker) > 0)){

  $count++;
  $attacker_key = array_rand($unit_attacker, 1);
  $attacker     =& $unit_attacker[$attacker_key];
  $defender_key = array_rand($unit_attacker_def, 1);
  $defender     =& $unit_attacker_def[$defender_key];

  $hit = ($attacker['attack']/$defender['defense']) + rand(1, 2);
  echo "<tr><td>{$count}.xx {$attacker_key} xJednotka {$defender['name']} ({$defender['power']} hp) bola zranená a dostala {$hit} zranenia jednotkou {$attacker['name']} ({$attacker['power']} hp)</td></tr>";
  $defender['power'] = $defender['power'] - $hit;
  $attacker['power'] = $attacker['power'] - $hit;

  if ($defender['power'] <= 0) {
    echo "Jednotka {$defender['name']} umrela, jednotka {$attacker['name']} vyhrala!\n";
    unset($defender[$defender_key]);
    break;

  }
    if ($attacker['power'] <= 0) {
    echo "Jednotka {$attacker['name']} umrela, jednotka {$defender['name']} vyhrala!\n";
    unset($attacker[$attacker_key]);
    break;
  }
}
 ?>
 </table>
 <? 
         break;