[RESOLVED] Learning OOP - what is the '__' for?

[AreenMarie]

I'm learning OOP and found the magic constants, but while reviewing some example code I've found instances of the '__' that don't make sense and I can't find it in the documentation. Here's some examples taken from different classes:

 $_POST['notice'] = __('Settings Saved', 'regplus');

 $title = __('Categories');

 if ( !current_user_can('manage_categories') )
     wp_die(__('Cheatin’ uh?'));

 wp_mail($user_email, sprintf(__('[%s] Verify Account Link', 'regplus'), get_option('blogname')), $message);

If this code is part of the construct() or destruct(), then I'm afraid I don't understand it. Would someone please provide an explanation or a link to the PHP5 documentation to which this applies?

Thanks

[laserlight]

Since is a valid function name, and the wp_ prefix means that this example code is probably Wordpress related, I would venture a guess that the Wordpress framework includes a function named that is called in the example you found. Based on my experience, I would also guess further that this function is part of some translation functionality in the framework.

[AreenMarie]

laserlight --

You are brilliant. I found the function in WordPress and it does indeed have to do with translation. Never realized that '__' could be used as a valid name. Thank you.