src/Camunda/Query/Attribute/Key.php
public function setKey(?string $key)
    {
        $this->key = $key;
        $this->_key = null !== $key;

        return $this;
    }
public function setKey(?string $key)
    {
        $this->key = $key;
        $this->_key = null !== $key;

        return $this;
    }
public function setKey ( ? string $ key ) { $ this -> key = $ key ; $ this -> _key = null !== $ key ; return $ this ; }
Set key

@param string $key
@return object
Set key