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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