php/mysql (appending html color codes to mysql table values)

This is php specific question. Is it possible to store html color codes in mysql table. So that when there is a php echo, it outputs the values in colors? For all my empty fields, I want to show the background color as red. Can I define a default function in mysql which will append a default colo开发者_StackOverflow中文版r scheme to empty fields? thanks.

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Sure, it it possible. You will save it as any other string.. so save "FF00FF" and than you will get this string from your db.
Edit: You don't have to store "#" I suppose - Depends on later use that you are planning.

Edit2: Is this about changing background color of table cell (during rendering) depending on its value? Your Q is unclear to me. But if I understand it correctly, then you can just make simple check like (pseudo):

if (value == null) color = "#FFFFFF";
echo color;

Depending on your rendering logic of course.