PHP 4, PHP 5, PHP 7, PHP 8
bcsqrt - Get the square root of an arbitrary precision number

bcsqrt( string$num, [int|null$scale = null] ): string

Return the square root of the num.



The operand, as a string.


This 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.

Return Values

Returns the square root as a string, or null if num is negative.


Version Description
8.0.0 scale is now nullable.

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Function bcsqrt:

BCMath Arbitrary Precision Mathematics Functions

Most used PHP functions