gmp_sub
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.
gmp_testbit
(PHP 5 >= 5.3.0)
gmp_testbit — Tests if a bit is set
설명
bool gmp_testbit
( resource $a
, int $index
)
Tests if the specified bit is set.
반환값
성공할 경우 TRUE를, 실패할 경우 FALSE를 반환합니다.
오류/예외
E_WARNING is issued when index is less than zero.
예제
Example #1 gmp_testbit() example
<?php
$n = gmp_init("1000000");
var_dump(gmp_testbit($n, 1));
gmp_setbit($n, 1);
var_dump(gmp_testbit($n, 1));
?>
위 예제의 출력:
bool(false) bool(true)
add a note
User Contributed Notesgmp_testbit
bluej100@gmail
19-Jul-2007 09:48
19-Jul-2007 09:48