The UnderflowException class

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


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|null $previous = null)
final public Exception::getMessage(): string
final public Exception::getPrevious(): Throwable|null
final public Exception::getCode(): int
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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User Contributed Notes 1 note

evguenia dot chagnon at gmail dot com
4 years ago
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
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