src/ErrorHandler/ErrorEmailer.php
public function setCfg($mixed, $newVal = null)
    {
        $ret = null;
        if (\is_string($mixed)) {
            $ret = isset($this->cfg[$mixed])
                ? $this->cfg[$mixed]
                : null;
            $this->cfg[$mixed] = $newVal;
        } elseif (\is_array($mixed)) {
            $ret = \array_intersect_key($this->cfg, $mixed);
            $this->cfg = \array_merge($this->cfg, $mixed);
        }
        return $ret;
    }
public function setCfg($mixed, $newVal = null)
    {
        $ret = null;
        if (\is_string($mixed)) {
            $ret = isset($this->cfg[$mixed])
                ? $this->cfg[$mixed]
                : null;
            $this->cfg[$mixed] = $newVal;
        } elseif (\is_array($mixed)) {
            $ret = \array_intersect_key($this->cfg, $mixed);
            $this->cfg = \array_merge($this->cfg, $mixed);
        }
        return $ret;
    }
Set one or more config values

If setting a single value via method a or b, old value is returned

setCfg('key', 'value')
setCfg(array('k1'=>'v1', 'k2'=>'v2'))

@param string $mixed  key=>value array or key
@param mixed  $newVal value

@return mixed