The gmp_popcount() is a built-in function in PHP which is used to find the population count of a GMP number (GNU Multiple Precision : For large numbers). We can also say that this function is used to find the number of set bits in the binary representation of a GMP number.
gmp_popcount ( $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 an integer which is the population count or the number of set bits in binary representation of a GMP number passed to it as parameter.
Input : "9" Output : 2 Input : "25" Output : 3
Below programs illustrate the gmp_popcount() function in PHP :
Program 1: Program to calculate the population count of a number when numeric strings as GMP numbers are passed as arguments.
Program 2: Program to calculate the population count of a number when GMP numbers are passed as arguments.