gmp_scan1

(PHP 4 >= 4.0.4, PHP 5)

gmp_scan1 -- Scan for 1

Description

int gmp_scan1 ( resource a, int start )

Scans a, starting with bit start, towards more significant bits, until the first set bit is found. Returns the index of the found bit. If no set bit is found, -1 is returned.

Example 1. gmp_scan1() example

<?php
// "1" bit is found at position 3. index starts at 0
$s1 gmp_init("01000"2);
echo 
gmp_scan1($s10) . "\n";

// "1" bit is found at position 9. index starts at 5
$s2 gmp_init("01000001111"2);
echo 
gmp_scan1($s25) . "\n";
?>

The printout of the above program will be:

3
9