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 PHP manuál : function.gmp-scan1.html

gmp_scan1
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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.

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 printout of the above program will be: 

3
9
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