php - Memcache interesting bug - a:0:{} -

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the code simple

$mem = $this->memcache->get("memche_".$_session['userid']."_page_".$page);  if(empty($mem)){ // make query , save data memcache } else { // memcache }

but right there no data cache not empty if print_r($mem); 

a:0:{}

and pass if statement if(empty())

that not bug, have empty array stored in memcache. array empty, not variable referencing array.

var_dump(unserialize('a:0:{}')); array(0) { }

you should checking if $mem false ($mem===false), not if empty. memcache returns false if cache key doesn't exist.


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