gmp_scan1

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_scan1Scan for 1

Descrição

gmp_scan1(GMP|int|string $num1, int $start): int

Scans num1, starting with bit start, towards more significant bits, until the first set bit is found.

Parâmetros

num1

The number to scan.

Um objeto GMP, um int ou uma string numérica.

start

The starting bit.

Valor Retornado

Returns the index of the found bit, as an int. If no set bit is found, -1 is returned.

Exemplos

Exemplo #1 gmp_scan1() example

<?php
// "1" bit is found at position 3. index starts at 0
$s1 = gmp_init("01000", 2);
echo
gmp_scan1($s1, 0) . "\n";

// "1" bit is found at position 9. index starts at 5
$s2 = gmp_init("01000001111", 2);
echo
gmp_scan1($s2, 5) . "\n";
?>

O exemplo acima produzirá:

3
9

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