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Json.php
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<?php namespace Rakit\Validation\Rules; use Rakit\Validation\Rule; class Json extends Rule { /** @var string */ protected $message = "The :attribute must be a valid JSON string"; /** * Check the $value is valid * * @param mixed $value * @return bool */ public function check($value): bool { if (! is_string($value) || empty($value)) { return false; } json_decode($value); if (json_last_error() !== JSON_ERROR_NONE) { return false; } return true; } }