The gmp_scan1() is an inbuilt function which is used to scan “1” in the GMP number(GNU Multiple Precision : For large numbers) starting from given index which move towards most significant bits in the number.
Syntax:
gmp_scan1($num, $index)
Parameters: This function accepts two parameters as explained below:
- $num: This parameter is a GMP number and is mandatory to be passed. 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.
- $index: This parameter represents the index or position in the bitwise representation of the number $num from where we want to start the search.
Return Value: The function returns the position where we find “1” in the number.
Examples:
Input : gmp_scan1("101111101", 6)
Output : 8
Input : gmp_scan1("111001111", 2)
Output : 3
Below programs illustrate the gmp_scan1() function in PHP:
Program 1: Program to find the position of “1” bit in GMP number when numeric strings as GMP numbers are passed as arguments.
<?php // PHP program to find position of "1" bit in GMP // number passed as arguments // strings as GMP numbers $num = "10110001"; $pos = 2; echo gmp_scan1($num, $pos) . "\n"; ?> |
Output:
4
Program 2: Program to find the position of “1” bit in GMP number when GMP numbers are passed as arguments.
<?php // PHP program to find position of "1" bit in GMP // number //creating GMP numbers using gmp_init() $num = gmp_init(10001111101); $pos = 2; echo gmp_scan1($num, $pos) . "\n"; ?> |
Output:
3
Reference:
http://php.net/manual/en/function.gmp-scan1.php
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