src/FlexiPeeHP/FlexiBeeRO.php
public function setFilter($filter)
    {
        return $this->filter = is_array($filter) ? self::flexiUrl($filter) : $filter;
    }
public function setFilter($filter)
    {
        return $this->filter = is_array($filter) ? self::flexiUrl($filter) : $filter;
    }
public function setFilter ( $ filter ) { return $ this -> filter = is_array ( $ filter ) ? self :: flexiUrl ( $ filter ) : $ filter ; }
Set Filter code for requests

@link https://www.flexibee.eu/api/dokumentace/ref/zamykani-odemykani/

@param array|string $filter filter formula or ['key'=>'value']

@return string Filter code
Set Filter code for requests