<?php set_error_handler(?callable $callback, int $error_levels = E_ALL): ?callable
<?php $value = is_resource($value) ? stream_get_contents($value) : $value; set_error_handler(function (int $code, string $message): bool { throw ConversionException::conversionFailedUnserialization($this->getName(), $message); }); try { return unserialize($value);