gmp_testbit

(PHP 5 >= 5.3.0, PHP 7)

gmp_testbit — Tests if a bit is set

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gmp_testbit ( GMP $a , int $index ) : bool

Tests if the specified bit is set.

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a

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index

The bit to test

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

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

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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));
?>

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bool(false)
bool(true)

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