(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.
num1The number to scan.
GMP 对象、int 或 string，可以按照跟在 gmp_init() 中使用字符串并自动检测 base（即当 base 等于 0 时）相同的逻辑将其解释为数字。
startThe starting bit.
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