UnderflowException()

(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

UnderflowExceptionextendsRuntimeException{/*继承的属性*/protectedstring $message;protectedint $code;protectedstring $file;protectedint $line;/*继承的方法*/

finalpublicException::getMessage(void): string

finalpublicException::getPrevious(void): Throwable

finalpublicException::getCode(void): int

finalpublicException::getFile(void): string

finalpublicException::getLine(void): int

finalpublicException::getTrace(void): array

finalpublicException::getTraceAsString(void): string

publicException::__toString(void): string

finalprivateException::__clone(void): void

}

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