(PHP 4 >= 4.0.4, PHP 5, PHP 7)
Scan for 1
int gmp_scan1 ( GMP $a, int $start )
Scans a, starting with bit start, towards more significant bits, until the first set bit is found.
Parameters:
a
The number to scan.
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
start
The starting bit.
Returns:
Returns the index of the found bit, as an integer. If no set bit is found, -1 is returned.
Examples:
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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