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
Description
bool gmp_testbit
( resource
$a
, int $index
)Tests if the specified bit is set.
Parameters
-
a -
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
-
index -
The bit to test
Return Values
Returns TRUE if the bit is set in resource $a,
otherwise FALSE.
Errors/Exceptions
An E_WARNING level error is issued when
index is less than zero, and FALSE
is returned.
Examples
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));
?>
The above example will output:
bool(false) bool(true)
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User Contributed Notes
gmp_testbit - [1 notes]
bluej100@gmail ¶
5 years ago