input.php

<?php

// In the InputCollection class, I have this.
// Basically, the issue is that when user called "validate", it should returns a "ValidationResult" object. However,
// this method needs to recursively calls each children input collection. BUT I don't want the children input filter to
// return a validation result, instead I want them return a simple array of error messages, that will be aggregated by
// the top input collection.
//
// I've thought about having validate(array $data, $context = null, $buildValidationResult = false);
// But it's ugly
// I think it'd be better to split this method into two, with a protected method that return error messages.
// Idea about naming?

    /**
     * {@inheritDoc}
     */
    public function validate(array $data, $context = null)
    {
        $iterator         = $this->getValidationGroupFilter();
        $iteratorIterator = new IteratorIterator($iterator);

        foreach ($iteratorIterator as $inputOrInputCollection) {
            if ($inputOrInputCollection instanceof InputInterface) {
                
            }
        }
    }