Posted by Janwillem Borleffs on 06/05/05 15:24

L Robbins wrote:
> Given that the names of the objects are predictable, it
> would be possible for me to write some code which looped sequentially
> through the object names $object1, $object2, etc., until it reached
> an object name which didn't exist. However, I was expecting there to
> be a tidier, easier way of doing the same thing with a command that
> says simply "List all instances of class X."
>
> Could you please tell me how to do this, or why it is not possible?

There is no function that returns all the instances of a class. If you want
to keep track of them, you could store them in an array or loop through the
$GLOBALS array and test each key with is_object() and instanceof (or is_a()
when not using PHP5).

When using PHP5, you could also keep track of all created instances as
follows:

<?php

class Foo {
private static $instance_count = 0;
public static function getInstanceCount() {
return self::$instance_count;
}

function __construct() {
self::$instance_count++;
}

function __destruct() {
self::$instance_count--;
}
}

$foo = new Foo;
print Foo::getInstanceCount(); // 1

unset($foo);
print Foo::getInstanceCount(); // 0

?>


JW

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