note 98114 added to function.gmp-strval

A gotcha when using the value from gmp_strval as a key in an associative array. Some numbers are 2^31 are converted to signed integer format, this is usually incorrect.

<?php

$a = gmp_init('2147483649'); // = 2^31 + 1
$b = gmp_init('3173604585'); // = 2^31 < $b < 2^32 

$c = gmp_strval($a);
$d = gmp_strval($b);

$e = array($c => 'c', $d => 'd');

print '*** Expect '."\n";
print 'Array '."\n".'('."\n".'    ['.$c.'] => c'."\n".'    ['.$d.'] => d'."\n".')'."\n\n";
print '*** Actual '."\n";
print_r($e);

?>

Output:

*** Expect
Array
(
    [2147483649] => c
    [3173604585] => d
)

*** Actual
Array
(
    [-2147483647] => c
    [3173604585] => d
)

A workaround is to format as base 16 and append '0x' before using as a key.
----
Server IP: 69.147.83.197
Probable Submitter: 199.243.246.66
----
Manual Page -- http://www.php.net/manual/en/function.gmp-strval.php
Edit        -- https://master.php.net/note/edit/98114
Del: integrated  -- https://master.php.net/note/delete/98114/integrated
Del: useless     -- https://master.php.net/note/delete/98114/useless
Del: bad code    -- https://master.php.net/note/delete/98114/bad+code
Del: spam        -- https://master.php.net/note/delete/98114/spam
Del: non-english -- https://master.php.net/note/delete/98114/non-english
Del: in docs     -- https://master.php.net/note/delete/98114/in+docs
Del: other reasons-- https://master.php.net/note/delete/98114
Reject      -- https://master.php.net/note/reject/98114
Search      -- https://master.php.net/manage/user-notes.php