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This document uses PHP Chinese website manual Release
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_scan0 — Scan for 0
$a
, int $start
)
Scans a
, starting with bit
start
, towards more significant bits,
until the first clear bit is found.
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.
Returns the index of the found bit, as an integer . The index starts from 0.
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 ( $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