(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_scan1 — Scan for 1
Scans
num1
, starting with bit
start
, towards more significant bits,
until the first set bit is found.
num1
The number to scan.
A
GMP
object, an
int
,
or a
string
that can be interpreted as a number following the same logic
as if the string was used in
gmp_init()
with automatic
base detection (i.e. when
base
is equal to 0).
start
The starting bit.
Returns the index of the found bit, as an int . If no set bit is found, -1 is returned.
Example #1 gmp_scan1() example
<?php
// "1" bit is found at position 3. index stars at 0
$s1
=
gmp_init
(
"01000"
,
2
);
echo
gmp_scan1
(
$s1
,
0
) .
"\n"
;
// "1" bit is found at position 9. index stars at 5
$s2
=
gmp_init
(
"01000001111"
,
2
);
echo
gmp_scan1
(
$s2
,
5
) .
"\n"
;
?>
The above example will output:
3 9