help to delete from array

hi  all,
I want to make generator for form fields so that I can add/delete/update  tables, and in each table I can add/delete/update fields.
it works fine tell I try to delete the last field in the table it does not  responde and I don't know why also I done some tracing it confuse me

now my question is can you please help me to make it work just fine?

thanks in advance
best regards
HG


here is the code:
<?php
/*
echo "<pre>";
print_r ($_REQUEST);
echo "</pre><br />";
*/

if (isset($del_table))
{
      $del_table= str_replace("del table","",$del_table);
      echo($del_table);
}


if (isset($add_field))
{
      $add_field= str_replace("add field","",$add_field);
      echo($add_field);
}

if (isset($del_field))
{
      $del_field= str_replace("del field","",$del_field);
      echo($del_field);
}
?>

<form name="f" method="post" action="load.php">
<input name="add_table" type="submit" value="add table" /> <br />


<?php
      $table_name=$_REQUEST['table_name'];
      
      if(isset($del_table))
      {
            array_splice($table_name,$del_table,1);
      }
      //print_r($table_name);

      for($x=0; $x < count($table_name); $x++)
      {
?>
            table:<input name="table_name[]" type="text"
            value="<?php echo $table_name[$x];?>" />
                        
            <input  name="del_table" type="submit"
                  value="del table<?php echo $x;?>" />

            <input  name="add_field" type="submit"
                  value="add field<?php echo $x;?>" />
            <br />
            
            <?php
            $fields[$x]= $_REQUEST["field$x"];
            
            

            if(isset($del_table))
            {
                  array_splice($fields,$del_table,1);
            }
            if (isset($add_field))
            {
                  $add_field= str_replace("add field","",$add_field);
                  $pieces= explode ("_", $add_field);
                  
            }

            

            if(isset($fields[$x]))
            {
                  $tmp=$fields[$x];
                  echo "count of tmp ". count($tmp);
                        echo "<pre>";
                        print_r ($fields[$x]);
                        echo "</pre><br />";

                  for($y=0; $y < count($tmp); $y++)
                  {
                        
                        if(isset($del_field))
                        {
                              $pieces= explode ("_", $del_field);
                              
                              if($pieces[0]==$x and $pieces[1]==$y )
                              {
                                    if (count($tmp<=1))
                                    {
                                          unset($tmp);
                                    }
                                    else
                                    {
                                    array_splice($tmp,$pieces[1],1);
                                    }      
                                    
                              }
                              $fields[$x]=$tmp;
                        }
                        
                        
            ?>
                        &nbsp;&nbsp;&nbsp;&nbsp;field<input name="field<?php echo $x; ?>[]" type="text" value="<?php echo $tmp[$y]?>" />
                        <input  name="del_field" type="submit"
                              value="del field<?php echo $x."_".$y;?>" />
                        <br />            

            <?php
                  }
            }      
            ?>

            <?php
            if (isset($add_field))
            {
                  if($add_field==$x)
                  {
            ?>
            &nbsp;&nbsp;&nbsp;&nbsp;field<input name="field<?php echo $x; ?>[]" type="text" value="" />
            <input  name="del_field" type="submit"
                              value="del field<?php echo $x."_".$y;?>" /><br />            
            <?php
                  }
            }
            ?>

<?php
      }
?>


<?php
if ($_REQUEST['add_table']=="add table")
{
?>
      table:<input name="table_name[]" type="text" />
       
<br />
<?php
}
?>

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