= 4.0.4, PHP 5, PHP 7, PHP 8)gmp_scan0 — Scan for 0說明gmp_scan0(GMP|int|string $num1, int $start): intScans num1, starting with bit st">

gmp_scan0

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_scan0 — Scan for 0

說明

gmp_scan0(GMP|int|string $num1, int $start): int

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

參數(shù)

num1

The number to scan.

GMP 對象或 int ，或數(shù)字string。

start

The starting bit.

返回值

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

范例

示例 #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";
?>

以上例程會(huì)輸出：

3
7