(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_scan0 — Scan for 0
gmp_scan0 ( GMP|int|string $num1 , int $start ) : int
Scans num1, starting with bit start, towards more significant bits, until the first clear bit is found.
num1
The number to scan.
A GMP object, an int or a numeric string.
start
The starting bit.
Returns the index of the found bit, as an int. The index starts from 0.
Example #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";
?> The above example will output:
3 7
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https://www.php.net/manual/en/function.gmp-scan0.php