[mapguide-users] Re: sum of a field on selected items

[Jackie Ng]

A high-level overview:

In a PHP script, create a MgSelection from your MgMap.

Call GetLayers on the MgSelection

For each MgLayer in this result, if the layer's name matches the one you're
interested in (Agencies), call GetSelectedFeatures on MgSelection using this
layer

Loop through the MgFeatureReader returned by this method, get the value of
the population property and accumulate it to a running total.

- Jackie

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