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.
Syntax:
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.
Examples:
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.
<?php // PHP program to calculate population count // of a GMP number passed as arguments   // strings as GMP numbers $num1 = "9"; $num2 = "25";   // calculates the population count of a number $pcount = gmp_popcount($num1); echo $pcount."\n";   // calculates the population count of a number $pcount = gmp_popcount($num2); echo $pcount."\n";   ?> |
Output:
2 3
Program 2: Program to calculate the population count of a number when GMP numbers are passed as arguments.
<?php // PHP program to calculate population count // of a GMP number passed as arguments   // creating GMP numbers using gmp_init() $num1 = gmp_init(9, 10); $num2 = gmp_init(25, 10);   // calculates the population count of a number $pcount = gmp_popcount($num1); echo $pcount."\n";   // calculates the population count of a number $pcount = gmp_popcount($num2); echo $pcount."\n";   ?> |
Output:
2 3
Reference:
http://php.net/manual/en/function.gmp-popcount.php
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