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-   -   Callbacks are nifty (https://vborg.vbsupport.ru/showthread.php?t=106325)

filburt1 01-25-2006 09:49 PM
Callbacks are nifty
 
I finally found a way to emulate an event firing model from Java: callbacks. http://www.php.net/callback and http://www.php.net/create_function . Nowhere near as clean as Java with implementing interfaces and providing listeners, but it works:
PHP Code:
// go-go anonymous functions
$callback = create_function(
        "\$step, \$stepcount, \$status, \$result = false",
        "if (\$step >= 0)
        {
            vbms_installer_update_progress(\$step, \$stepcount, \$status);
        }
        else
        {
            vbms_installer_die(\$status, \$result);
        }");
$installer->upgrade($callback); 
Now $installer->upgrade() will fire the callback function as it executes, providing status updates. Calling the callback is as simple as:
PHP Code:
$callback($step, $stepcount, $status); 
Of course, in Java, it would be more like:
Code:
installer.addUpdateListener(new InstallerUpdateListener()
{
    public void statusChanged(int step, int stepCount, String status, Object result)
    {
        ...
    }
});
installer.upgrade();
...but that would require PHP 5 at least because of the abstractifiedness needed.

Andreas 01-25-2006 11:15 PM
May I ask why you are using create_function()?

filburt1 01-26-2006 12:25 AM
To create an anonymous function rather than one publicly accessible by every other bit of code.


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