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E_COMPILE_ERROR Declaration must be compatible ...


Joined: 24 Mar 2010
Posts: 30
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I irregulary receive the following error message ... i think generated by the DBG module of php. (It appears sometimes, after maybe some thousand executions, generated by Firefox's "reload every")

http ://www.kwicpix.de/display-i13866bpz7ln.html (plz. remove space after http)

executing the following test script and don't understand why MySecond::serialize() should be compatible with MySerializable::setUnserializedData, which are totally different functions at all. Maybe someone here has an idea?!

TIA Eutychus

Code:
<?php

trait MySerializable {

   public function serialize() {
      return serialize($this->getSerializeData());
   }

   public function unserialize($serialized) {
      $this->setUnserializedData(@unserialize($serialized));
   }

   /**
    * This method should return a data attributes of an object ...
    *
    * @return array
    */
   abstract protected function getSerializeData();

   abstract protected function setUnserializedData($data);

}

class MyFirst implements Serializable {

   use MySerializable;

   protected $firstVar = "hello";
   protected $secondVar = "world";
   protected $thirdVar = NULL;

   public function __construct() {
      $this->thirdVar = new MyThird();
   }

   protected function getSerializeData() {
      return [
         "firstVar" => $this->firstVar,
         "secondVar" => $this->secondVar,
         "thirdVar" => $this->thirdVar,
      ];
   }

   protected function setUnserializedData($data) {
      $this->firstVar = $data["firstVar"];
      $this->secondVar = $data["secondVar"];
      $this->thirdVar = $data["thirdVar"];
   }

}

class MySecond extends MyFirst {

   use MySerializable;

   protected $extended = "ext";

   protected function getSerializeData() {
      return array_merge(parent::getSerializeData(), [ "extended" => $this->extended ]);
   }

   protected function setUnserializedData($data) {
      parent::setUnserializedData($data);
      $this->extended = $data["extended"];
   }

}

class MyThird implements Serializable {

   use MySerializable;

   protected $thirdsVar = "BLUE";
   protected $thirdsSecondVar = NULL;

   protected function getSerializeData() {
      return [
         "thirdsVar" => $this->thirdsVar,
         "thirdsSecondVar" => $this->thirdsSecondVar,
      ];
   }

   protected function setUnserializedData($data) {
      $this->thirdsVar = $data["thirdsVar"];
      $this->thirdsSecondVar = $data["thirdsSecondVar"];
   }

}

session_set_save_handler("__open", "__close", "__read", "__write", "__destroy", "__gc");

function __open() {}

function __close() {}

function __destroy() {}

function __gc() {}

function __read($id) {
   return file_get_contents("test.session");
   return serialize([
      "first" => new MyFirst(),
      "second" => new MySecond(),
   ]);
}

function __write($id, $data) {
   file_put_contents("test.session", $data);
   echo $data."<br />\n";
}

session_name("ts");
session_start();

if ( empty($_SESSION) ) {
   $_SESSION["execCounter"] = 0;
   $_SESSION["first"] = new MyFirst();
   $_SESSION["second"] = new MySecond();
}
$_SESSION["execCounter"]++;

session_write_close();

?>
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