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gmp_testbit

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

gmp_testbitTests if a bit is set

Descrição

gmp_testbit(GMP|int|string $num, int $index): bool

Tests if the specified bit is set.

Parâmetros

num

Um objeto GMP, um int ou uma string numérica.

index

The bit to test

Valor Retornado

Returns true if the bit is set in num, otherwise false.

Erros/Exceções

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

Exemplos

Exemplo #1 gmp_testbit() example

<?php
$n
= gmp_init("1000000");
var_dump(gmp_testbit($n, 1));
gmp_setbit($n, 1);
var_dump(gmp_testbit($n, 1));
?>

O exemplo acima produzirá:

bool(false)
bool(true)

Veja Também

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User Contributed Notes 1 note

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bluej100@gmail
16 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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