PHP Unconference Europe 2015

gmp_testbit

(PHP 5 >= 5.3.0)

gmp_testbitTests if a bit is set

Descrição

bool gmp_testbit ( resource $a , int $index )

Tests if the specified bit is set.

Parâmetros

a

Ele pode ser qualquer número GMP resource, ou uma string numérica que é possível convertê-la para um número.

index

The bit to test

Valor Retornado

Returns TRUE if the bit is set in resource $a, otherwise FALSE.

Erros

An E_WARNING level error is issued when index is less than zero, and FALSE is returned.

Exemplos

Exemplo #1 gmp_testbit() example

<?php
$n 
gmp_init("1000000");
var_dump(gmp_testbit($n1));
gmp_setbit($n1);
var_dump(gmp_testbit($n1));
?>

O exemplo acima irá imprimir:

bool(false)
bool(true)

Veja Também

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User Contributed Notes 1 note

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bluej100@gmail
7 years ago
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.
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