gmp_scan0()

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

Scan for 0

说明

gmp_scan0(GMP$a,int $start): int

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

参数

$a

The number to scan.

可以是一个 GMP数据resouce，或一个可以转换为数值的字符串。

$start

The starting bit.

返回值

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

范例

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";
?>

以上例程会输出：

3
7