gmp_scan1
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
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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https://www.php.net/manual/en/function.gmp-scan1.php