[snip]
Is there a way to change the value of a global variable when someon clicks a
<a href> URL link on a web page?
[/snip]

If the variable is sent via GET i.e.;

http://something.com/foo.php?bar=stuff

then you could;

$bar = $_GET['bar']; //where $bar is the global to be changed, $bar would
now = stuff

HTH!

Jay

Next mood swing…6 minutes

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