PHP | gmp_sqrt() Function (original) (raw)

Last Updated : 11 Jul, 2025

The gmp_sqrt() is a built-in function in PHP which is used to calculate the square root of a GMP number (GNU Multiple Precision : For large numbers). This function returns only the integral part of the square root of the GMP number.Syntax:

gmp_sqrt ( $num )

Parameters: This function accepts a GMP number $num as a mandatory parameter as shown in the above syntax. This parameter can be a GMP object in PHP version 5.6 and later, or we are also allowed to pass a numeric string provided that it is possible to convert that string to a number. Return Value: This function returns a GMP number which is the square root of a GMP number passed to it as parameter. This function only returns the integral part of the square root of the GMP number passed to it as argument. Examples:

Input : "9" Output : 3

Input : "24" Output : 4

Below programs illustrate the gmp_sqrt() function in PHP :Program 1: Program to calculate the square root of a GMP number when numeric strings as GMP numbers are passed as arguments.

php `

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Output:

3 4

Program 2: Program to calculate the square root of a GMP number when GMP numbers are passed as arguments.

php `

`

Output:

3 4

Reference: https://www.php.net/manual/en/function.gmp-sqrt.php