PHP: this is $ this-> something & # 8594; ($ this-> foo) & # 8594; bar legal?

Question

Is this line legal PHP?

$this->mongo->($this->db)->$collection_name->insert($document_name);

if $ this-> db is a constant using the name db.

thank

Answer 1

No, strings (and therefore your constant) must be enclosed in brackets, for example:

$this->mongo->{$this->db}->$collection_name->insert($document_name);

Answer 2

Try using curly braces instead of parentheses:

$this->mongo->{$this->db}->$collection_name->insert($document_name);

Or by assigning to the $this->dblocal var and using this instead:

$db_name = $this->db;
$this->mongo->$db_name->$collection_name->insert($document_name);

Answer 3

$connection->db->collection :

$this->mongo->selectDB($this->db)->selectCollection($collection_name)->insert(...);

. +1 BoltClock , $x->y->z.

Answer 4

, → () → mongo → ($ this- > db) → $coll... ,

$this->mongo($this->db)->$collection_name->insert($document_name);

Answer 5

$this->mongo->selectDB($this->db)->$collection_name->insert($document_name)