Manual do PHP Referência das Funções Outras Extensões Básicas SPL Exceptions UnderflowException RuntimeException UnexpectedValueException The UnderflowException class (PHP 5 >= 5.1.0) Introdução Exception thrown when performing an invalid operation on an empty container, such as removing an element. Sinopse da classe UnderflowException extends RuntimeException { /* Propriedades herdadas */ protected string $message ; private string $string ; protected int $code ; protected string $file ; protected int $line ; private array $trace ; /* Métodos herdados */ final public string Exception::getMessage ( void ) final public int Exception::getCode ( void ) final public string Exception::getFile ( void ) final public string Exception::getLine ( void ) final public array Exception::getTrace ( void ) final public string Exception::getTraceAsString ( void ) public string Exception::__toString ( void ) final private string Exception::__clone ( void ) }