code optimization

[Stepan Kafka]

Hi Julien,
   the data are bubbling thru classes until the expression is true, so you may use simply the syntax:

CLASS
		NAME "0 - 200"
		EXPRESSION ([ELEVAC]< 200)
...
END
CLASS
		NAME "201 - 300"
		EXPRESSION ([ELEVAC]< 300)
 ...

etc

If the data are preclassified to unique values (eg 2,3,4,5), you will get better performance

CLASSITEM "ELEVAC"

CLASS
  NAME "0-200"
  EXPRESSION "2"
...

For the best performance use the most frequent dataset values in the first class.

Stepan Kafka

Hi,
i'm working with fgs-mapserver and php-mapscript.
i was wondering if i'd rather develop the php code using the php class or on the contrary develop the map file.
For example, i want to display a layer with level line. I could build the class with php or i could write several class in my map file, someting like:
	CLASS
		NAME "201-300"
		EXPRESSION (([ELEVAC]> 200) and ([ELEVAC]< 301))
          STYLE
			SIZE 1
			COLOR 100 40 0
          END
        END

what's the best way?

thx for your advice.

julien