PHP 5.4.33 Released

gmp_scan0

(PHP 4 >= 4.0.4, PHP 5)

gmp_scan0Scan for 0

说明

int gmp_scan0 ( GMP $a , int $start )

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

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

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