PHP Rounding Question

[Rick Dwyer <rpdwyer@xxxxxxxxxxxxx>]

I have a division formula that will return an value from 0.00 to 5...  
so I can get values like 2.38 or 4.79.

However, never lower than 0 or higher than 5.

How do I coerce the result to always round up to the nearest increment  
1/4?  So for example:

2.06 gets rounded to 2.25
0.01 gets rounded to 0.25
4.28 gets rounded to 4.50
3.71 gets rounded to 3.75

Thanks,

 --Rick



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