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# gmp_scan1

(PHP 4 >= 4.0.4, PHP 5)

gmp_scan1 -- Scan for 1

## Description

int gmp_scan1 ( resource a, int start )

Scans a, starting with bit start, towards more significant bits, until the first set bit is found. Returns the index of the found bit. If no set bit is found, -1 is returned.

範例 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 printout of the above program will be:

    3
    9

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