looping through queries

[Jordan Pritt]

I have a query that generates 2 - 10 rows of results. What I want to do is check each row for X and then either show that result or query a different row in its place. I'm sure there has to be a way to loop though the rows while querying them, but I'm still new to MySQL. Any thoughts would appreciated!

Example of desired result:
row 1: a (check was true)
row 2: b (check was true)
row 3: c (check was false) change c to e
row 4: d (check was true)