(PHP 4 >= 4.0.4, PHP 5)
gmp_scan1 — Scan for 1
Scans a , starting with bit start , towards more significant bits, until the first set bit is found.
The number to scan.
Може да бъде или ресурс на GMP число, или числов низ, който може да бъде преобразуван в число.
The starting bit.
Returns the index of the found bit, as an integer. If no set bit is found, -1 is returned.
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";
?>
Примерът по-горе ще изведе:
3 9