[PHP] Foreach loop with empty values

[CDitty]

I have a foreach loop in a while loop that retrieves information from my 
database.  The foreach loop works fine if there is data in the database for 
that loop.  But if nothing is found in the database, I get a "Invalid 
argument supplied" error.

Can anyone suggest a fix for this?  The foreach loop is a standard foreach.

Code
foreach($pid as $netPid){
        echo "$netPid<br>";
}
Chris

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