This is very common problem: set one variable to another, if
it is not empty. If it is, set it to something else.
For example: set $bar to $foo, if $foo is empty, set $bar to
"undefined";
if(!empty($foo)) $bar= $foo; else $bar=
"undefined";
OR operator can shorten it:
$bar=  $foo or $bar= "undefined";
----
Server IP: 147.32.160.17
Probable Submitter: 81.2.196.33
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