I need something like this.

$format:="<tr><td>{0}</td><td>{1}</td><td>{2}</td></tr>"

write($format %% ( "abc";"";"xyz" )) //-> "<tr><td>abc</ td><td>-</td><td>xyz</td></tr>"

The condition is: IF value is empty take  "-" ELSE take the value.

Use 'param text' instead of %%.

$format := "<tr><td>#1#-#^1#</td><td>#2#-#^2#</td><td>#3#-#^3#</td></ tr>"
write(param text($format; "abc"; ""; "xyz"))

Kind regards,

   Aparajita
   www.aparajitaworld.com

   "If you dare to fail, you are bound to succeed."
   - Sri Chinmoy   |   www.srichinmoy.org

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