gmp_scan1

gmp_scan1

Scan for 1

int **gmp_scan1**  $num1 int $start

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

num1The number to scan.

startThe starting bit.

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

Voorbeeld: 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";
?>

3
9