mysql order by rand limit 1 really slow
function get_random_row($mytable,$conn){
$table_max_id = $conn->query("SELECT id FROM $mytable ORDER BY id DESC LIMIT 0, 1")[0]["id"];
$rand_id=rand(1,$table_max_id);
$random_result = $conn->query("select * from $mytable where id = $rand_id");
#note: if you are missing some id's, we can call again until we get hit
if(!$random_result){
return get_random_row($mytable,$conn);
}
return $random_result;
}