How to store value permanently in an array using php

I want to store these submitted values. Can it be possible without database? using just array. I don’t want to store values for a session. Just for long time unless deleted.

1. <form id="form1" name="form1" method="post" action="">
2. <form id="form1" name="form1" method="post" action="">
4. <p>
5. <label for="num1">Some text</label>
6. <input type="text" name="num1" id="num1" />
7. </p>
8. <p>
9. <label for="num2">some text</label>
10. <input type="text" name="num2" id="num2" />
11. </p>
12. <p>
13. <input type="radio" name="r" id="add" value="add" />
14. <label for="add">Addition</label>
15. </p>
16. <p>
17. <input type="radio" name="r" id="sub" value="sub" />
18. <label for="sub">Subtraction</label>
19. </p>
20. <p>
21. <input type="radio" name="r" id="mul" value="mul" />
22. <label for="mul">Multiplication</label>
23. </p>
24. <p>
25. <input type="radio" name="r" id="div" value="div" />
26. <label for="div">Division</label>
27. </p>
29. <p>
30. <label for="select">select</label>
31. <select>
32. <option value="volvo">Volvo</option>
33. <option value="saab">Saab</option>
34. <option value="opel">Opel</option>
35. <option value="audi">Audi</option>
36. </select>
37. </p>
38. </form>