GMP Functions
PHP Manual

gmp_scan0

Scan for 0

Description

int gmp_scan0(GMPintstring $num1, int $start)

Scans num1, starting with bit start, towards more significant bits, until the first clear bit is found.

Parameters

num1

The number to scan.

A GMP object, an int or a numeric string.

start

The starting bit.

Return Values

Returns the index of the found bit, as an int. The index starts from 0.

Examples

Example #1 gmp_scan0 example

<?php
// "0" bit is found at position 3. index starts at 0
$s1 = gmp_init("10111", 2);
echo gmp_scan0($s1, 0) . "\n";

// "0" bit is found at position 7. index starts at 5
$s2 = gmp_init("101110000", 2);
echo gmp_scan0($s2, 5) . "\n";
?>

The above example will output:

3
7