Help with Small PHP Program (Arrays and Sorting)

I am having trouble with a small PHP program. I have to load item and amount data from table cells into an array, and then be able to sort and reverse sort the items in the cells. I also have to track the errors when non-numeric data is entered a s an amount, and total the numeric amounts (These parts I think I have coded correctly.).

I am having trouble with the array part.  I don't think item values are   being loaded into the array.  I debugged it as much as I could.  My code is here-- .

I am completely new to this, having only done little PHP/JavaScript   programs like this for some classes in the last few months.  Any help would be greatly   appreciated.
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