what is %variable% in a wordpress plugin? [closed]

I found the answer to my question :

$somename = array(
'user_score' => 'somevalue',
...
)

So it was a key of an array that calls its value.
(I hope I’ve put it into words correctly.)

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)