PHP Conference China 2020

gmp_scan0

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

gmp_scan0Scan 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.

PHP 5.5 之前为 GMP 数值资源,PHP 5.6 之后为 GMP 对象或数字,或可以转为数字的字符串。

start

The starting bit.

返回值

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

范例

Example #1 gmp_scan0() example

<?php
// "0" bit is found at position 3. index starts at 0
$s1 gmp_init("10111"2);
echo 
gmp_scan0($s10) . "\n";

// "0" bit is found at position 7. index starts at 5
$s2 gmp_init("101110000"2);
echo 
gmp_scan0($s25) . "\n";
?>

以上例程会输出:

3
7

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top