Class yii\helpers\BaseJson

 public static function decode($json, $asArray = true) { if (is_array($json)) { throw new InvalidArgumentException('Invalid JSON data.'); } elseif ($json === null || $json === '') { return null; } $decode = json_decode((string) $json, $asArray); static::handleJsonError(json_last_error()); return $decode; }  

 public static function encode($value, $options = 320) { $expressions = []; $value = static::processData($value, $expressions, uniqid('', true)); set_error_handler(function () { static::handleJsonError(JSON_ERROR_SYNTAX); }, E_WARNING); if (static::$prettyPrint === true) { $options |= JSON_PRETTY_PRINT; } elseif (static::$prettyPrint === false) { $options &= ~JSON_PRETTY_PRINT; } $json = json_encode($value, $options); restore_error_handler(); static::handleJsonError(json_last_error()); return $expressions === [] ? $json : strtr($json, $expressions); }  

 public static function errorSummary($models, $options = []) { $showAllErrors = ArrayHelper::remove($options, 'showAllErrors', false); $lines = self::collectErrors($models, $showAllErrors); return static::encode($lines); }  

 protected static function handleJsonError($lastError) { if ($lastError === JSON_ERROR_NONE) { return; } if (PHP_VERSION_ID >= 50500) { throw new InvalidArgumentException(json_last_error_msg(), $lastError); } foreach (static::$jsonErrorMessages as $const => $message) { if (defined($const) && constant($const) === $lastError) { throw new InvalidArgumentException($message, $lastError); } } throw new InvalidArgumentException('Unknown JSON encoding/decoding error.'); }  

 public static function htmlEncode($value) { return static::encode($value, JSON_UNESCAPED_UNICODE | JSON_HEX_QUOT | JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS); }  

 protected static function processData($data, &$expressions, $expPrefix) { $revertToObject = false; if (is_object($data)) { if ($data instanceof JsExpression) { $token = "!{[$expPrefix=" . count($expressions) . ']}!'; $expressions['"' . $token . '"'] = $data->expression; return $token; } if ($data instanceof \JsonSerializable) { return static::processData($data->jsonSerialize(), $expressions, $expPrefix); } if ($data instanceof \DateTimeInterface) { return static::processData((array)$data, $expressions, $expPrefix); } if ($data instanceof Arrayable) { $data = $data->toArray(); } elseif ($data instanceof \Generator) { $_data = []; foreach ($data as $name => $value) { $_data[$name] = static::processData($value, $expressions, $expPrefix); } $data = $_data; } elseif ($data instanceof \SimpleXMLElement) { $data = (array) $data; // Avoid empty elements to be returned as array. // Not breaking BC because empty array was always cast to stdClass before. $revertToObject = true; } else { /* * $data type is changed to array here and its elements will be processed further * We must cast $data back to object later to keep intended dictionary type in JSON. * Revert is only done when keepObjectType flag is provided to avoid breaking BC */ $revertToObject = static::$keepObjectType; $result = []; foreach ($data as $name => $value) { $result[$name] = $value; } $data = $result; // Avoid empty objects to be returned as array (would break BC without keepObjectType flag) if ($data === []) { $revertToObject = true; } } } if (is_array($data)) { foreach ($data as $key => $value) { if (is_array($value) || is_object($value)) { $data[$key] = static::processData($value, $expressions, $expPrefix); } } } return $revertToObject ? (object) $data : $data; }