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Edit File: CollectionValidator.php

<?php
namespace MailPoetVendor\Symfony\Component\Validator\Constraints;
if (!defined('ABSPATH')) exit;
use MailPoetVendor\Symfony\Component\Validator\Constraint;
use MailPoetVendor\Symfony\Component\Validator\ConstraintValidator;
use MailPoetVendor\Symfony\Component\Validator\Exception\UnexpectedTypeException;
use MailPoetVendor\Symfony\Component\Validator\Exception\UnexpectedValueException;
class CollectionValidator extends ConstraintValidator
{
 public function validate($value, Constraint $constraint)
 {
 if (!$constraint instanceof Collection) {
 throw new UnexpectedTypeException($constraint, Collection::class);
 }
 if (null === $value) {
 return;
 }
 if (!\is_array($value) && !($value instanceof \Traversable && $value instanceof \ArrayAccess)) {
 throw new UnexpectedValueException($value, 'array|(Traversable&ArrayAccess)');
 }
 // We need to keep the initialized context when CollectionValidator
 // calls itself recursively (Collection constraints can be nested).
 // Since the context of the validator is overwritten when initialize()
 // is called for the nested constraint, the outer validator is
 // acting on the wrong context when the nested validation terminates.
 //
 // A better solution - which should be approached in Symfony 3.0 - is to
 // remove the initialize() method and pass the context as last argument
 // to validate() instead.
 $context = $this->context;
 foreach ($constraint->fields as $field => $fieldConstraint) {
 // bug fix issue #2779
 $existsInArray = \is_array($value) && \array_key_exists($field, $value);
 $existsInArrayAccess = $value instanceof \ArrayAccess && $value->offsetExists($field);
 if ($existsInArray || $existsInArrayAccess) {
 if (\count($fieldConstraint->constraints) > 0) {
 $context->getValidator()->inContext($context)->atPath('[' . $field . ']')->validate($value[$field], $fieldConstraint->constraints);
 }
 } elseif (!$fieldConstraint instanceof Optional && !$constraint->allowMissingFields) {
 $context->buildViolation($constraint->missingFieldsMessage)->atPath('[' . $field . ']')->setParameter('{{ field }}', $this->formatValue($field))->setInvalidValue(null)->setCode(Collection::MISSING_FIELD_ERROR)->addViolation();
 }
 }
 if (!$constraint->allowExtraFields) {
 foreach ($value as $field => $fieldValue) {
 if (!isset($constraint->fields[$field])) {
 $context->buildViolation($constraint->extraFieldsMessage)->atPath('[' . $field . ']')->setParameter('{{ field }}', $this->formatValue($field))->setInvalidValue($fieldValue)->setCode(Collection::NO_SUCH_FIELD_ERROR)->addViolation();
 }
 }
 }
 }
}

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