function Sql::key

Implementation of \Iterator::key().

This is called when entering a loop iteration, returning the key of the current row. It must be a scalar - we will serialize to fulfill the requirement, but using getCurrentKey() is preferable.

File

core/modules/migrate/src/Plugin/migrate/id_map/Sql.php, line 943

Class

Sql

Defines the sql based ID map implementation.

Namespace

Code

public function key() : mixed {
    return serialize($this->currentKey);
}