(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_scan0 — Scan for 0
Scans num1, starting with bit
start, towards more significant bits,
until the first clear bit is found.
Returns the index of the found bit, as an int. The index starts from 0.
示例 #1 gmp_scan0() example
<?php
// "0" bit is found at position 3. index starts at 0
$s1 = gmp_init("10111", 2);
echo gmp_scan0($s1, 0) . "\n";
// "0" bit is found at position 7. index starts at 5
$s2 = gmp_init("101110000", 2);
echo gmp_scan0($s2, 5) . "\n";
?>以上示例会输出：
3 7