Formatting of a number

Hi- I have a number that I am trying to format. It is data coming from a main frame and has 8 characters assigned to it (6 and two decimal places). I have zerofill set up in MySQL on this field and am working on the best way to display the number. Currently I have this: $sOutput = number_format(rtrim($sValue,'0') /100,2); What I am running into is this, I have a number in this field as: 3145900, using the above I will get: 314.59, which is wrong, it needs to be 3,145.90. Yet, if I have a number of: 749450, I get the result I am looking for of 749.45. I did not see a way to tell trim I only want one 0 cut? Any thoughts? Thank you! -Scott