Communication from php to as3 in AIR

Gidday guys
I have an AIR desktop app that uploads a csv file to the server. Php parses the csv through several different stages (one script containing different parsing processes).
Php sends back a 'print' status to say if the process succeeds or not.
What I'm wondering - is it possible to send back print statements throughout the script's processing? So a print statement after process 1, after process 2 etc? Or would I have to split the single script into multiple processes?
I set up multiple print statements in different sections of the php script, but it sends all them after the entire script has processed.
Cheers

Close - there are several for-loops, but rather than a percentage update during the loops, I just want to send a var back after each loop is done.
I use these listeners to display a progress bar while the file is uploading, and check in AS3 for when event.bytesLoaded == event.bytesTotal, and when it does turn off the progress bar and display a generic animated progress image. I figured I could then fire back vars in between each php loop which I could filter in AS3 using switch to display the appropriate message - Stage 1, Stage 2 etc.
myFile.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA, completeFunc,false,0,true);
myFile.addEventListener(IOErrorEvent.IO_ERROR, displayErrorMessage);
myFile.addEventListener(ProgressEvent.PROGRESS, uploadProgress);

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