(PHP 4, PHP 5, PHP 7)
bcsqrt — Get the square root of an arbitrary precision number
$operand
[, int $scale = 0
] )
Return the square root of the operand.
operandThe operand, as a string.
scaleThis optional parameter is used to set the number of digits after the decimal place in the result. If omitted, it will default to the scale set globally with the bcscale() function, or fallback to 0 if this has not been set.
Returns the square root as a string, or NULL if
operand is negative.
Example #1 bcsqrt() example
<?php
echo bcsqrt('2', 3); // 1.414
?>