[PHP] strange error

[n e t b r a i n]

Hi all,
I don't know why this (quick & dirty) small function:

function esiste_url($file){
        @$fp=fopen($file,"r");
        if(!$fp){return false;}else{return true;}
        @fclose($fp);
}
//it checks if a url submit via form client exist

in two different pages:

a.php3 ---> works fine
b.php3 ---> produce an Internal Error Server

In both file, it's used like this:
if(esiste_url($url)==false){ etc. etc.

I'm sure (?!) that in b.php3 the error is due to this function 'cause w/o
it, the page b.php3 works fine ...

(I'm on linux box,apache,php3)

Any ideas??
Many thanks in advance
max


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