gmp_scan0
PHP function
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(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
Scan for 0
Description
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.
Parameters
num1The number to scan.
Parameter
startThe starting bit.
Return Values
Returns the index of the found bit, as an int. The index starts from 0.
Errors/Exceptions
Throws a ValueError if start is negative or, as of PHP 8.5.0, too large.
Prior to PHP 8.0.0, an E_WARNING was raised instead.
Examples
gmp_scan0() example
php
<?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:
output
3
7