GMP_SCAN1(3) 1 GMP_SCAN1(3)
gmp_scan1 - Scan for 1
SYNOPSIS
int gmp_scan1 (GMP $a, int $start)
DESCRIPTION
Scans $a, starting with bit $start, towards more significant bits, until the first set bit is found.
PARAMETERS
o $a
- The number to scan. Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string
provided that it is possible to convert the latter to a number.
o $start
- The starting bit.
RETURN VALUES
Returns the index of the found bit, as an integer. If no set bit is found, -1 is returned.
EXAMPLES
Example #1
gmp_scan1(3) example
<?php
// "1" bit is found at position 3. index starts at 0
$s1 = gmp_init("01000", 2);
echo gmp_scan1($s1, 0) . "
";
// "1" bit is found at position 9. index starts at 5
$s2 = gmp_init("01000001111", 2);
echo gmp_scan1($s2, 5) . "
";
?>
The above example will output:
3
9
PHP Documentation Group GMP_SCAN1(3)
