how to call a function when somebody click a link?

i want to creat a link
when somebody click the link
the php script calls a function,then display itself :)

i have tried
<a href=<? funtion(); echo=$_server['php_self'] ?>text</a>
but it will call the function whether i click the link


then i tried this (using forms)
<form action="<?php function(); echo "<script>"; echo
"window.location.href=$_SERVER['PHP_SELF']"; echo '</script>';?>">
<input type="submit" value="text" /></form>
but it didnot work either.
my browser said there were parse errors,T_STRING expected or
something....:(


now i am thinking using a flag,say,$functioncall,
href=$_server[request_url]&functioncall=1
then if functioncall==1,call that function
but is it right?
is there some way simple to do that?


any suggestion is appreciated :)

.

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