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";
?>
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The printout of the above program will be:
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