Php/docs/function.gmp-scan1
gmp_scan1
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_scan1 — Scan for 1
Description
gmp_scan1
( GMP $a
, int $start
) : int
Scans a
, starting with bit
start
, towards more significant bits,
until the first set bit is found.
Parameters
a
The number to scan.
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
start
The starting bit.
Return Values
Returns the index of the found bit, as an int. If no set bit is found, -1 is returned.
Examples
Example #1 gmp_scan1() example
<?php// "1" bit is found at position 3. index starts at 0$s1 = gmp_init("01000", 2);echo gmp_scan1($s1, 0) . "\n";// "1" bit is found at position 9. index starts at 5$s2 = gmp_init("01000001111", 2);echo gmp_scan1($s2, 5) . "\n";?>
The above example will output:
3 9