Comments on: PHP garbage collection and memory leaks

By: Gary Reckard

Gary Reckard — Sun, 05 Sep 2010 21:03:30 +0000

Wow, thank you! This actually solved my problem. I'm importing 30k+ products into an ecommerce system, and was only getting like 100 or so done at a time. I has also tried a method of picking up where the script died, but that wouldn't be feasible. You rock.

By: Paul

Paul — Mon, 19 Oct 2009 14:31:53 +0000

This helped... I'm working with objects, so it's a little different for me.

You need to cache objects that are created within a method, where the method's return value is the result of a function call on the newly created object.


class a {
  function b() { 
    $c = new c();
    // memory leaking here.
    return $c->d();
  }
}
class c { 
  function d() { 
    return 3+5;
  }
}

Fixed:
class a {
  var $objc;
  function b() { 
    // create if not exists, else use cached object.
    if( !is_object($this->objc) ) { 
      $this->objc = new c();
    }
    return $this->objc->d();
  }
}

By: Paul

Paul — Mon, 19 Oct 2009 10:31:53 +0000


class a {
  function b() { 
    $c = new c();
    // memory leaking here.
    return $c->d();
  }
}
class c { 
  function d() { 
    return 3+5;
  }
}

Fixed:
class a {
  var $objc;
  function b() { 
    // create if not exists, else use cached object.
    if( !is_object($this->objc) ) { 
      $this->objc = new c();
    }
    return $this->objc->d();
  }
}

By: Brandon Savage

Brandon Savage — Wed, 09 Sep 2009 14:33:09 +0000

This did help me. Thanks for posting it. I did exactly what you did and my application works properly.

By: Tom Lancaster

Tom Lancaster — Sun, 15 Mar 2009 07:00:19 +0000

thanks for this insight. You’ve just saved me a lot of time on a script that I’m using to update my whole database. This technique works.