gmp_scan1

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gmp_scan1 — Scan for 1

说锟斤拷

gmp_scan1 ( GMP $a , int $start ) : int

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

锟斤拷锟斤拷

a

The number to scan.

锟斤拷锟斤拷锟斤拷一锟斤拷 GMP 锟斤拷锟斤拷 resouce锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷转锟斤拷为锟斤拷值锟斤拷锟街凤拷锟斤拷锟斤拷

start

The starting bit.

锟斤拷锟斤拷值

Returns the index of the found bit, as an integer. If no set bit is found, -1 is returned.

锟斤拷锟斤拷

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";
?>

锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�

3
9