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.
例子 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:
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