Increment and Decrement Implementation Not Working Correctly

[cbeech]

Increment and decrement don't appear to be functioning correctly. I did the following

$m->set('testkey',0);
var_dump($m->get('testkey'));
var_dump($m->increment('testkey'));
var_dump($m->get('testkey'));

which output

int(0)
bool(true)
int(2147483647)

2147483647 is 0x7FFFFFFF

I was expecting the value returned to be 1.

[ronnywang]

my output is
int(0)
bool(true)
int(1)

on PHP 5.4.9 & Memcached 1.4.14

can you give me your PHP or Memcached version ?