PHP | gmp_mul() Function
The gmp_mul() function in PHP is an inbuilt function which is used to multiply two GMP numbers (GNU Multiple Precision: For large numbers).
GMP gmp_mul ( GMP $num1, GMP $num2 )
Parameters: This function accepts two GMP numbers. It is mandatory parameters as shown in the above syntax. These can be a GMP object in PHP version 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number. This function multiplies these two numbers and returns it.
Return Value: This function returns a GMP number which is multiplication of the two numbers passed as parameter.
Input : num1 = "123456789" num2 = "987654321" Output: 121932631112635269 Input : num1 = "9999999" num2 = "99999" Output: 999989900001
Below programs illustrate the gmp_mul() function in PHP: