The UnderflowException class

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

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 */

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

}

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