The UnderflowException class

Introduction

(PHP 5 >= 5.1.0, PHP 7)

Exception thrown when performing an invalid operation on an empty container, such as removing an element.

Class synopsis

UnderflowException extends RuntimeException {
/* Inherited properties */
protected string $message ;
protected int $code ;
protected string $file ;
protected int $line ;
/* Inherited methods */
public Exception::__construct ([ string $message = "" [, int $code = 0 [, Throwable $previous = null ]]] )
final public Exception::getMessage ( ) : string
final public Exception::getPrevious ( ) : Throwable
final public Exception::getCode ( ) : mixed
final public Exception::getFile ( ) : string
final public Exception::getLine ( ) : int
final public Exception::getTrace ( ) : array
final public Exception::getTraceAsString ( ) : string
public Exception::__toString ( ) : string
final private Exception::__clone ( ) : void
}

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https://www.php.net/manual/en/class.underflowexception.php