Break Chain

[The Little Guy]

I have a chain of methods, is there anyway to end the chain half way through if some particular event happens?

 

Here is an example (not the best but still an example):

<?php
$age = $class->post("age")->callback(funciton(){
        global $class;
        if($class->string() < 18){
                // end the execution of the chain, doesn't execute toInt()
        }
})->toInt();
?>

[btherl]

An exception can break out of anything.  But if you don't always want to execute a particular method you probably shouldn't be writing it in a chain in the first place.  Or you can replace it with a mutant method which can handle both types of output from the previous stage in the chain.  That's the typical approach in functional and logic languages where you have no choice about chaining.