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    The UnderflowException class

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

    Introduction

    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

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    evguenia dot chagnon at gmail dot com
    7 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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