gmp_testbit

(PHP 5 >= 5.3.0, PHP 7)

gmp_testbitTests if a bit is set

설명

bool gmp_testbit ( GMP $a , int $index )

Tests if the specified bit is set.

인수

a

PHP 5.5 이전에서 GMP 수 resource나, PHP 5.6 이후에서 GMP 객체, 또는 수로 변환할 수 있는 문자열일 수 있습니다.

index

The bit to test

반환값

Returns TRUE if the bit is set in resource $a, otherwise FALSE.

오류/예외

An E_WARNING level error is issued when index is less than zero, and FALSE is returned.

예제

Example #1 gmp_testbit() example

<?php
$n 
gmp_init("1000000");
var_dump(gmp_testbit($n1));
gmp_setbit($n1);
var_dump(gmp_testbit($n1));
?>

위 예제의 출력:

bool(false)
bool(true)

참고

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User Contributed Notes 1 note

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bluej100@gmail
14 years ago
gmp_testbit will be very useful for my (over 64-bit) bitmask checking.

In the meantime, I think these are the best replacements.

Mostly full:

<?php
(gmp_scan1($a, $index) == $index)
?>

Mostly empty:

<?php
(gmp_scan0($a, $index) != $index)
?>

Still worst-case O(N), though.
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