Optimize Foreach inside Foreach

Hello I need to optimize this code: [login to view URL] Explaining the code, $temporadas have about 20 rows, and $episodios have about 1000 rows.. I need to put each episodio with temporadaID inside current temporada container.. The problem as you can see, is that if we have 20 rows of $temporada and 1000 rows of $episodio, we will loop 20,000 times. I though in leave $episodio foreach outside $temporada, and organize the episodios with Javascript after complete the loop.