managing labels+check on usage of labelcache

[Andrea Giacomelli]

Hi,
 
I'd like to use "county names" as labels in a map. 
given the type of morphology of the admin boundaries (mix of county shapes and length of names quite variable, tending to be long), I need to zoom to a rather small scale to avoid names being omitted (if I keep the FORCE flag to FALSE for the labels), or over-writing (if the FORCE flag is set to TRUE).
 
e.g. I have tried activating the BUFFER option to improve the output, but I don't observe any differences in my output...
 
a doubt I have first of all is that I am passing the proper labelcache assignment via PHP mapscript.
 
$myLayer2->set("labelcache",MS_TRUE);
 
should I be using MS_ON or "on" instead of MS_TRUE ?
 
TIA for any feedback,

Andrea

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