toPrecision () returns a String representing the Number object in fixed-point or exponential notation rounded to significant digits. So if you ... ... <看更多>

toPrecision. Summary. Represents a number either in exponential or fixed-point notation with a specified number of digits. ... <看更多>

public DecimalNumber::toPrecision ( int $precision [, string $roundingMode = Rounding::ROUND_TRUNCATE ] ): string. Examples:. ... <看更多>