New to php, so please bear with me.

I created a php page, which reads four values from an array
[$symbols = array('531524','531683','503031','522229');]
After this each of the numbers are read and processed.

I dont like the fact that the values are hard-coded. I wanted to create a form with four textboxes, and on submitting the form the values of the four textboxes should be fed into the array, and processing of the page should continue as usual.

Could anyone tell me how to go about doing this?
thank you