1.*crment functions:
int Memcache::decrement ( string $key [, int $value ] )//自减 默认值为1
int Memcache::increment ( string $key [, int $value ] )//自增 默认值为1
$memcache = new Memcache;
$memcache->connect('127.0.0.1', 11211);
$memcache->set('num',6);//value 为num
echo $memcache->get('num'); //输出6
echo $memcache->decrement('num', 3);//输出3
$memcache->set('num','x');//value 为string
echo $memcache->decrement('num', 3);//输出0
increment和decrment相似:
$memcache->set('num','x');//value 为string
echo $memcache->increment('num', 3);//
输出3
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