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(PHP 4 >= 4.0.4, PHP 5)
gmp_scan1 — Scan for 1
Scans a , starting with bit start , towards more significant bits, until the first set bit is found.
The number to scan.
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
The starting bit.
Returns the index of the found bit, as an integer. If no set bit is found, -1 is returned.
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
gmp_scan0
