bcsqrt

(PHP 4, PHP 5)

bcsqrt — Get the square root of an arbitrary precision number

string bcsqrt ( string $operand [, int $scale ] )

Return the square root of the operand .

operand: The operand, as a string.
scale: This optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale().

Returns the square root as a string, or NULL if operand is negative.

Example#1 bcsqrt() example


<?php

echo bcsqrt('2', 3); // 1.414

?>


	PHP5中文手册 bcscale bcsub BC math PHP Manual bcsqrt (PHP 4, PHP 5) bcsqrt — Get the square root of an arbitrary precision number 说明 string bcsqrt ( string `$operand` [, int `$scale` ] ) Return the square root of the `operand` . 参数 `operand` The operand, as a string. `scale` This optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale(). 返回值 Returns the square root as a string, or `NULL` if `operand` is negative. 范例 Example#1 bcsqrt() example `<?php echo bcsqrt('2', 3); // 1.414 ?>` 参见 bcpow() bcscale bcsub BC math PHP Manual