in multiple array $cards, implode("-",$cards["num"]) differs from concatenated string $cards["num"][...order...]

<?php
/* ?????? ??? ??? ??????? ????????? ??? ?????????? $game, $player */
function tria(&$cards){
echo "In order: " ;
for ($i=1;$i<=24;$i++){
       echo $cards["num"][$i]."-";
       }
echo "<BR>imploded: ";
$periexomeno=implode("-",$cards["num"]);
$aneinai20=implode("-",$cards["d20"]);
echo $periexomeno."<BR>";
}

//-----------------------------------------
function sorthim($poion,&$cards){
        $t=0;
        $kartesoldexei=array(1=>1);
        for ($i=1;$i<=24;$i++){
                            if ((($cards["PiT"][$i])< (8 + ($poion - 1) * 10)) and (($cards["PiT"][$i])>(($poion - 1) * 10))) {
			$t++;
			$kartesoldpoia[$t]=$i;
			$kartesoldpou[$t]=$cards["PiT"][$i];
			$kartesoldexei[$t]=$cards["num"][$i];
                	}  //if end
	}  // for end
        sort ($kartesoldexei);
        for ($i=1;$i<=$t;$i++){
                $cards["num"][$kartesoldpoia[$i]]=$kartesoldexei[$i-1];
                $cards["PiT"][$kartesoldpoia[$i]]=$kartesoldpou[$i];
                }
}
//-------------------------------------END OF FUNCTIONS---------------------------------------
$palia=array(1=>1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24);
$cards= array ("num"=>array(1=>1)
,"PiP"=>array(1=>1)
,"PiT"=>array(1=>1),
"d20"=>array(1=>"N")
,"d40"=>array(1=>"N")
,"nine"=>array(1=>"N")
,"can"=>array(1=>"N")
);
for ($i=24;$i;$i--){
      $randval=1;
      if  ($i<>1){
                     mt_srand ((double) microtime() * 1000000);
                     $randval = mt_rand(1,$i) ;
      }
      $cards["num"][$i]=$palia[$randval];
      if ($i<>$randval)
        $palia[$randval]=$palia[$i];
}                             //????  ???????? ?? ?????? ????????????
for ($i=1;$i<=24;$i++){
$cards["PiP"][$i]=$i;
$cards["PiT"][$i]=18;
$cards["d20"][$i]="N";
$cards["d40"][$i]="N";
$cards["nine"][$i]="N";
$cards["can"][$i]="N";
}
mt_srand ((double) microtime() * 1000000);
$randval = mt_rand(0,1) ;
for ($i=1;$i<=6;$i++){
        $cards["PiT"][$i]=$i;
        $cards["PiT"][$i+6]=10+$i;
        }
$cards["PiT"][13]=8;
$x=tria($cards);                 //print sample
$poion=1;
 sorthim ($poion,$cards);
$poion=2;
 sorthim ($poion,$cards);
$x=tria($cards);                //print sample
?>