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    gmp_scan1

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

    gmp_scan1 — Scan for 1

    Description

    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.

    Parameters

    num1

    The number to scan.

    A GMP object, an int or a numeric string.

    start

    The starting bit.

    Return Values

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

    Examples

    Example #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";
    ?>

    The above example will output:

    3
9

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