How to check if an object can be instantiated using PHP

Question

I can't do this but wondering what would work:

is_object(new Memcache){
   //assign memcache object    
   $memcache = new Memcache;
   $memcache->connect('localhost', 11211);
   $memcache->get('myVar');
}
else{
   //do database query to generate myVar variable
}

Answer 1

See class_exists

if (class_exists('Memcache')){
   //assign memcache object    
   $memcache = new Memcache;
   $memcache->connect('localhost', 11211);
   $memcache->get('myVar');
}
else{
   //do database query to generate myVar variable
}