PHP Manual
Function Reference
Database Extensions
Vendor Specific Database Extensions
MongoDB
MongoDB\BSON
MongoDB\BSON\Undefined
MongoDB\BSON\Undefined::__construct
MongoDB\BSON\Undefined::jsonSerialize
MongoDB\BSON\Undefined::serialize
MongoDB\BSON\Undefined::__toString
MongoDB\BSON\Undefined::unserialize
MongoDB\BSON\Undefined::serialize
MongoDB\BSON\Undefined::unserialize
MongoDB\BSON\Undefined
PHP Manual
MongoDB\BSON\Undefined::__toString
Returns an empty string
Description
final
public
string
MongoDB\BSON\Undefined::__toString
()
Parameters
This function has no parameters.
Return Values
Returns an empty string.
See Also
» BSON Types