LayoutRegistry.php
protected function getExtensions()
    {
        if (null === $this->sorted) {
            ksort($this->extensions);
            $this->sorted = !empty($this->extensions)
                ? call_user_func_array('array_merge', $this->extensions)
                : [];
        }

        return $this->sorted;
    }
protected function getExtensions()
    {
        if (null === $this->sorted) {
            ksort($this->extensions);
            $this->sorted = !empty($this->extensions)
                ? call_user_func_array('array_merge', $this->extensions)
                : [];
        }

        return $this->sorted;
    }
protected function getExtensions ( ) { if ( null === $ this -> sorted ) { ksort ( $ this -> extensions ) ; $ this -> sorted = ! empty ( $ this -> extensions ) ? call_user_func_array ( 'array_merge' , $ this -> extensions ) : [ ] ; } return $ this -> sorted ; }
Returns all registered extensions sorted by priority.

@return ExtensionInterface[]
Returns all registered extensions sorted by priority .