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 ` `// PHP program to calculate the square root ` `// of a GMP number passed as arguments ` ` ` `// strings as GMP numbers ` `$num1` `= ` `"9"` `; ` `$num2` `= ` `"24"` `; ` ` ` `// calculates the square root of a GMP number ` `$squareRoot` `= gmp_sqrt(` `$num1` `); ` `echo` `$squareRoot` `.` ```
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``` `; ` ` ` `// calculates the square root of a GMP number ` `$squareRoot` `= gmp_sqrt(` `$num2` `); ` `echo` `$squareRoot` `.` ```
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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 ` `// PHP program to calculate the square root ` `// of a GMP number ` ` ` `// creating GMP numbers using gmp_init() ` `$num1` `= gmp_init(9, 10); ` `$num2` `= gmp_init(24, 10); ` ` ` `// calculates the square root of a GMP number ` `$squareRoot` `= gmp_sqrt(` `$num1` `); ` `echo` `$squareRoot` `.` ```
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``` `; ` ` ` `// calculates the square root of a GMP number ` `$squareRoot` `= gmp_sqrt(` `$num2` `); ` `echo` `$squareRoot` `.` ```
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``` `; ` ` ` `?> ` |

Output:

3 4

**Reference: **

http://php.net/manual/en/function.gmp-sqrt.php

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