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Request #48311 Controllable object disposing
Submitted: 2009-05-17 16:50 UTC Modified: 2011-04-08 18:17 UTC
Votes:12
Avg. Score:4.2 ± 1.2
Reproduced:4 of 8 (50.0%)
Same Version:2 (50.0%)
Same OS:2 (50.0%)
From: av3ng3r at gmail dot com Assigned:
Status: Open Package: Scripting Engine problem
PHP Version: * OS: *
Private report: No CVE-ID: None
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 [2009-05-17 16:50 UTC] av3ng3r at gmail dot com
Description:
------------
An implementation like C# ( http://www.coderjournal.com/2007/02/proper-use-idisposable/ ) would be appreciated:

using(StreamReader reader = new StreamReader(stream))
{
   reader.write('blalblabab');
}

The class StreamReader implements an interface IDisposable, by implementing this interface (creating a function in the class called; Dispose) the user can use the statement `using` to control the disposal of the object manually instead of waiting of the garbage collection of PHP.

This would be usefull for controling database connections, socket connections, simplexml?, etc.


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 [2009-05-18 12:25 UTC] a at b dot c dot de
Your example would be handled by

$reader = new StreamReader($stream);
$reader->write('blahblahblah');
$reader = null; // $reader->__destruct() called

Objects and values are destroyed as soon as the last reference to them goes away. Remove those references, destroy the object.


$start = microtime(true);

class foo{
	private $name;
function __construct($name) {
	$this->name = $name;
}
function __destruct() {
	echo $this->name." Destroyed at ".(microtime(true)-$GLOBALS['start'])." seconds\n";
}

}

$t1 = new foo('t1');
$t2 = new foo('t2');
$t3 = new foo('t3');

echo "Set \$t1 to null at ".(microtime(true)-$start)." seconds\n";
$t1 = null;
echo "Sleep 5 seconds\n";
sleep(5);
echo "Replace \$t2 with \$t3 at ".(microtime(true)-$start)." seconds\n";
$t2 = $t3;
echo "Sleep 5 seconds\n";
sleep(5);
 [2009-05-18 22:13 UTC] av3ng3r at gmail dot com
I know that's a solution to cope with this. However code-wise it will be cleaner to let only live the reader variable of a certain scope.
 [2011-04-08 18:17 UTC] jani@php.net
-Summary: Controlable object diposing +Summary: Controllable object disposing -Package: Feature/Change Request +Package: Scripting Engine problem -Operating System: - +Operating System: * -PHP Version: 6CVS-2009-05-17 (CVS) +PHP Version: *
 [2019-01-10 23:06 UTC] maju at 10g dot pl
It would be nice if we could have a similar 'using(...){..}' keyword which would allow to control the scope of code block and force the disposal of the object/resource.
 [2019-01-10 23:15 UTC] maju at 10g dot pl
Thanks to this feature you could potentially do something like this:

<?

using(new Brace('div')){
  echo 'DIV INNER TEXT';
}
//this would output:<div>DIV INNER TEXT</div>

class Brace{
 private $tag;
 function __construct($tag) {
  $this->tag=$tag;
  echo "<$this->tag>";
 }
 function __destruct() {
  echo "</$this->tag>";
 }
}

?>
 
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