gistfile1.php

<?php

public function validateName($value) {
    $collection = new ErrorCollection;
   
    $error = ValidatorA::validate($value);
    if($error) {
        $collection->addError($error);
    }

    $error = ValidatorB::validate($value);
    if($error) {
        $collection->addError($error);
    }

    $error = ValidatorC::validate($value);
    if($error) {
        $collection->addError($error);
    }

    return count($collection) == 0 ? true : $collection;
}

gistfile2.php

<?php

public function validateName($value, &$error = null) {
    $error = null;

    ValidatorA::validate($value, $error);
    ValidatorB::validate($value, $error);
    ValidatorC::validate($value, $error);
    
    return !$error;
}