PHP 5.5.16 is released

gmp_com

(PHP 4 >= 4.0.4, PHP 5)

gmp_comCalcola il complemento a uno di 'a'

Descrizione

resource gmp_com ( resource $a )

Avviso

Questa funzione, al momento non è documentata; è disponibile soltanto la lista degli argomenti.

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xo at jdbartlett dot com
4 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)
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