gmp_scan1
(PHP 4 >= 4.0.4, PHP 5)
gmp_scan1 -- Scan for 1
Description
int
gmp_scan1 ( resource a, int start )
Scans a, starting with bit start, towards more significant bits, until the first set bit is found. Returns the index of the found bit. 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";
?> |
The printout of the above program will be: |