Re: how to count objects instances

Robert Cummings wrote:

On Mon, 2004-08-23 at 20:54, John Holmes wrote:

tyler@carbon.homelinux.com wrote:

hi, What is best method(if it's possible) to count how many times an object is instanced in one time script call? I means that if i have a class named "Test", i what to know how many times she's called, how many copies exists etc. The idea is for monitoring in the way to optimizing the code. The method get_declared_classes() only shows only the classes included/required.

There's no predefined variable or method for determining this, that I'm aware of, short of counting how many "new Test" lines you have. You could write a wrapper class for Test that kept count of the instances and returned a new object upon request...

In PHP5: <?php class Foo {

    static $instances = 0;

    function __construct()
    {
        Foo::$instances++;     }

    function __destruct()
    {
        Foo::$instances--;
    }

    static function getNumInstances()
    {
        return Foo::$instances;
    }

} $foo = new Foo(); $fee = new Foo(); echo 'Count: '.Foo::getNumInstances()."\n"; unset( $foo ); echo 'Count: '.Foo::getNumInstances()."\n"; Add this to the class as well:

public function __clone () { self::$instances++; // You might as well use the "self" operator } -- Daniel Schierbeck