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<?php
declare(strict_types=1);
namespace GraphQL\Type\Definition;
use Exception;
use GraphQL\Error\Error;
use GraphQL\Language\AST\IntValueNode;
use GraphQL\Language\AST\Node;
use GraphQL\Language\AST\StringValueNode;
use GraphQL\Utils\Utils;
use function is_array;
use function is_int;
use function is_object;
use function is_scalar;
use function is_string;
use function method_exists;
class IDType extends ScalarType
{
/** @var string */
public $name = 'ID';
public $description =
'The `ID` scalar type represents a unique identifier, often used to
refetch an object or as key for a cache. The ID type appears in a JSON
response as a String; however, it is not intended to be human-readable.
When expected as an input type, any string (such as `"4"`) or integer
(such as `4`) input value will be accepted as an ID.';
/**
* @param mixed $value
*
* @return string
* @throws Error
*/
public function serialize($value)
$canCast = is_string($value)
|| is_int($value)
|| (is_object($value) && method_exists($value, '__toString'));
if (! $canCast) {
throw new Error('ID cannot represent value: ' . Utils::printSafe($value));
}
return (string) $value;
public function parseValue($value)
if (is_string($value) || is_int($value)) {
* @param Node $valueNode
* @param mixed[]|null $variables
* @return string|null
* @throws Exception
public function parseLiteral($valueNode, ?array $variables = null)
if ($valueNode instanceof StringValueNode || $valueNode instanceof IntValueNode) {
return $valueNode->value;
// Intentionally without message, as all information already in wrapped Exception
throw new Exception();
webonyx /
graphql-php
