how to make a link only if exists

On my site is a database of articles in a few journals. The visitor
can get information by asking for the name of an author or a word in
the articles title. So far so good.
Some, but not all of the articles are in PDF. I would like to give the
visitor the opportunity to get the PDF file, but I want to present the
link only if there is a PDF file for this title. Is that possible?
At present the situation is:
while ($row=mysql_fetch_row($result))
{
echo"<td>$row[0]</td>";
echo"<td><a href=\"$row[5].pdf\">$row[1]</a></td>";
etcetera all relevant rows
}
As probably is clear row[0] contains authors, row[1] contains titles,
other row are used for finding place and in row[5] is the id of the
article (idart). This number is in the query but it is not presented
to the visitor. So the name of the PDF file is idart.pdf.
Should I make an if statement within the link?
Thank you,
Henny

Henny Boxa wrote:
> On my site is a database of articles in a few journals. The visitor
> can get information by asking for the name of an author or a word in
> the articles title. So far so good.
> Some, but not all of the articles are in PDF. I would like to give the
> visitor the opportunity to get the PDF file, but I want to present the
> link only if there is a PDF file for this title. Is that possible?
> At present the situation is:
> while ($row=mysql_fetch_row($result))
> {
> echo"<td>$row[0]</td>";
> echo"<td><a href=\"$row[5].pdf\">$row[1]</a></td>";
> etcetera all relevant rows
> }
> As probably is clear row[0] contains authors, row[1] contains titles,
> other row are used for finding place and in row[5] is the id of the
> article (idart). This number is in the query but it is not presented
> to the visitor. So the name of the PDF file is idart.pdf.
> Should I make an if statement within the link?

if(file_exists($row[5].'.pdf')) {
echo "<a href=\"$row[5].pdf\">$row[1]</a>";
}

--

//Aho