Avoid PHP Memory Leaks in Long-lived Objects

deep_objects.php

<?php

// Avoid PHP Memory Leaks in Long-lived Objects
// License: Public Domain

class LongLivedObject
{
   public function __construct() {
      echo "Object " . spl_object_hash($this) . " was just born!\n";
   }
   public function __destruct() {
      echo "Object " . spl_object_hash($this) . " just died.\n";
   }
}

$obj = new LongLivedObject;
function a($o) {
   return clone $o;
}

$obj2 = a(clone $obj);
unset($obj);
echo "Filler...\n";

// Object 0000000046d314f90000000034b03b6a was just born!
// Object 0000000046d314fa0000000034b03b6a just died.
// Object 0000000046d314f90000000034b03b6a just died.
// Filler...
// Object 0000000046d314fb0000000034b03b6a just died.