PHP/Class/ sleep

Controlling serialization using __sleep() and __wakeUp()

 
<?php
class LogFile {
    protected $filename;
    protected $handle;
  
    public function __construct($filename) {
        $this->filename = $filename;
        $this->open();
    }
    private function open() {
        $this->handle = fopen($this->filename, "a");
    }
  
    public function __destruct($filename) {
        fclose($this->handle);
    }
  
    public function __sleep() {
        return array("filename");
    }
  
    public function __wakeUp() {
        $this->open();
    }
}
?>

__sleep() method is called by serialize() before it packs up the object.

 
<?
class apple {
  var $flavor="sweet";
  var $frozen = 0;
  function ___sleep( ) {
    $this->frozen++;
    return array_keys( get_object_vars( $this) );
  }
}
$app = new apple ( );
$stored = serialize( $app );
print $stored;
?>