vendor/symfony/serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php line 28
<?php/** This file is part of the Symfony package.** (c) Fabien Potencier <fabien@symfony.com>** For the full copyright and license information, please view the LICENSE* file that was distributed with this source code.*/namespace Symfony\Component\Serializer\NameConverter;/*** CamelCase to Underscore name converter.** @author Kévin Dunglas <dunglas@gmail.com>*/class CamelCaseToSnakeCaseNameConverter implements NameConverterInterface{private $attributes;private $lowerCamelCase;/*** @param array|null $attributes The list of attributes to rename or null for all attributes* @param bool $lowerCamelCase Use lowerCamelCase style*/public function __construct(array $attributes = null, bool $lowerCamelCase = true){$this->attributes = $attributes;$this->lowerCamelCase = $lowerCamelCase;}public function normalize(string $propertyName): string{if (null === $this->attributes || \in_array($propertyName, $this->attributes)) {return strtolower(preg_replace('/[A-Z]/', '_\\0', lcfirst($propertyName)));}return $propertyName;}public function denormalize(string $propertyName): string{$camelCasedName = preg_replace_callback('/(^|_|\.)+(.)/', function ($match) {return ('.' === $match[1] ? '_' : '').strtoupper($match[2]);}, $propertyName);if ($this->lowerCamelCase) {$camelCasedName = lcfirst($camelCasedName);}if (null === $this->attributes || \in_array($camelCasedName, $this->attributes)) {return $camelCasedName;}return $propertyName;}}