The UnderflowException class

(PHP 5 >= 5.1.0, PHP 7)

简介

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

类摘要

UnderflowException extends RuntimeException {
/* 继承的属性 */
protected string $message ;
protected int $code ;
protected string $file ;
protected int $line ;
/* 继承的方法 */
final public Exception::getMessage ( void ) : string
final public Exception::getPrevious ( void ) : Throwable
final public Exception::getCode ( void ) : int
final public Exception::getFile ( void ) : string
final public Exception::getLine ( void ) : int
final public Exception::getTrace ( void ) : array
final public Exception::getTraceAsString ( void ) : string
public Exception::__toString ( void ) : string
final private Exception::__clone ( void ) : void
}

User Contributed Notes

evguenia dot chagnon at gmail dot com 26-Jan-2017 01:40
UnderflowException handles exceptions due to a value being too small to maintain precision, resulting in loss of accuracy. In PHP, this can occurs when using floats:

echo (1-0.9) // 0.1
echo (1-0.99) // 0.01
echo (1-0.999) // 0.001
echo (1-0.9999) // 9.9999999999989E-05
echo (1-0.99999) // 9.9999999999545E-06
echo (1-0.999999) // 1.0000000000288E-06