gmp_scan1
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_scan1 — Scan for 1
Description
Scans num1, starting with bit
start, towards more significant bits,
until the first set bit is found.
Parameters
num1-
The number to scan.
A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. whenbaseis equal to 0). start-
The starting bit.
Return Values
Returns the index of the found bit, as an int. If no set bit is found, -1 is returned.
Examples
Example #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";
?>The above example will output:
3 9
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