ScopedCallback.php

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<?php
class ScopedCallback {
    protected $callback;

    public function __construct( $callback ) {
        if ( !is_callable( $callback ) ) {
            throw new MWException( "Provided callback is not valid." );
        }
        $this->callback = $callback;
    }

    public static function consume( ScopedCallback &$sc = null ) {
        $sc = null;
    }

    public static function cancel( ScopedCallback &$sc = null ) {
        if ( $sc ) {
            $sc->callback = null;
        }
        $sc = null;
    }

    function __destruct() {
        if ( $this->callback !== null ) {
            call_user_func( $this->callback );
        }
    }
}