Kun gøre action x gange pr. dag

PHP kode 

 <?php
 include("databasehandler.php");
 include("log.php");
 
 class Plants {
    public $daySeconds =   86400;
    public $states     = array();
    public $user       =       0;
    public $maxPerDay  =      10;
    
    public function __construct() {
       $this->states[1] =   0;
       $this->states[2] =  10;
       $this->states[3] =  25;
       $this->states[4] =  50;
       $this->states[5] = 100;
       
       $this->user = 1;
    }
    
    public function DeleteAndUpgrade() {}
    public function giveWater() {
         $o = DatabaseHandler::get('id, state', 'plants', array("owner" => $this->user), 'q');
         $id = mysql_fetch_assoc($o); $pid = $id['id']; $state=$id['state'];
       
         $this->plantId = $pid;
         $this->currentState = $state;
         
         $dato = date("d-m-y");
         
         if ( $this->currentState >= 5) :
             echo "Du kan ikke opgradere til mere end stadie 5!"; exit;
          endif;
          
         $o = mysql_query("select tid, owner, plantid FROM watered WHERE owner = '".$this->user."' AND plantid = '".$this->plantId."' AND state = '".$this->currentState."' ORDER BY id DESC LIMIT 0,1");
         $l=mysql_fetch_assoc($o);
       
          $z=mysql_query("select id from watered where owner = '".$this->user."' AND plantid = '".$this->plantId."' AND tid = '".$dato."'");
          
          if ( mysql_num_rows($z) >= $this->maxPerDay ) :
             echo "Du kan kun vande 10 gange om dagen."; exit;
          endif;
          
          
          mysql_query("insert into watered (owner, plantid, tid, state) values ('".$this->user."','".$this->plantId."','".$dato."','".$this->currentState."')");
 
          $antalGangeVandet = mysql_query("select id FROM watered where owner = '".$this->user."' AND plantid = '".$this->plantId."' AND state = '".$this->currentState."'");
          $antalGangeVandet = mysql_num_rows($antalGangeVandet);
          
          echo "Vandede...(".$antalGangeVandet.")<br/>";
          
          if ( $antalGangeVandet == $this->states[$this->currentState+1]):
              mysql_query("update watered SET state = state+1 WHERE owner = '".$this->user."' AND plantid = '".$this->plantId."'") or die ( mysql_error());
              mysql_query("update plants SET state = state+1 WHERE owner = '".$this->user."' AND id = '".$this->plantId."'") or die ( mysql_error());
 
              echo "Opgraderde fra ".$this->currentState." til ".intval($this->currentState+1);
              
              $this->currentState = intval($this->currentState+1);
              $this->DeleteAndUpgrade();
          endif;
    }
    public function makePlant() {
      $o = DatabaseHandler::get('id', 'plants', array("owner" => $this->user), '');
      if ( mysql_num_rows($o) == 0 ) :
         DatabaseHandler::insert(array("owner" => $this->user, "state" => 1, "type" => mt_rand(1,3)), 'plants');
      endif;
     }
 }
 
 $C = new DatabaseHandler();
 $Plant = new Plants;
 
 if ( isset ( $_POST['o'] )) :
    $Plant->makePlant();
    $Plant->giveWater();
 endif;
 
 
 ?>
 
 <form action="" method="post">
 <input type="submit" value="Opret plante" name="o" />