(PHP 5 >= 5.3.0)
gmp_testbit — Tests if a bit is set
$a
, int $index
)Tests if the specified bit is set.
a
可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。
index
The bit to test
Returns TRUE if the bit is set in resource $a,
otherwise FALSE.
An E_WARNING level error is issued when
index is less than zero, and FALSE
is returned.
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));
?>
以上例程会输出：
bool(false) bool(true)
bluej100@gmail (2007-07-19 14:48:38)
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.