gmp_com
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_com — 1 の補数を計算する
戻り値
num についての 1 の補数を GMP 数で返します。
例
例1 gmp_com() の例
<?php
$com = gmp_com("1234");
echo gmp_strval($com) . "\n";
?>上の例の出力は以下となります。
-1235
＋add a note
User Contributed Notes 1 note
xo at jdbartlett dot com ¶
14 years ago
If you're using one's compliment (bitwise NOT) to flip all $a's bits, don't forget that you need to use a mask to specify how many bits you expect in your result:
<?php gmp_and(gmp_com('1234'), '2047') ?>
>> 813 // 01100101101 in binary
I chose 2047 because 1234 is an 11-bit binary number and 2047 is the maximum an 11-bit register can hold:
11111111111 (2047)
10011010010 (1234)
01100101101 (813)
↑ and ↓ to navigate •
Enter to select •
Esc to close
Press Enter without
selection to search using Google