function Lookup($exptidx)
{
global $experiment_cache;
$args = func_get_args();
# Look in cache first
if (array_key_exists("{$exptidx}", $experiment_cache)) {
return $experiment_cache["{$exptidx}"];
}
$foo = new Experiment($exptidx);
if ($foo->IsValid()) {
# Insert into cache.
$experiment_cache["{$exptidx}"] =& $foo;
return $foo;
}
# Try lookup with pid,eid.
if (count($args) == 2) {
$pid = array_shift($args);
$eid = array_shift($args);
$foo = Experiment::LookupByPidEid($pid, $eid);
# Already in the cache from LookupByPidEid() so just return it.
if ($foo && $foo->IsValid()) {
return $foo;
}
}
return null;
}
