Description:
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i have one script which use file_exists 
am upfrading from php4 
after upgrade my page take 7 or 10 seconds to exectuted 
i test the same script under php4 it take less than 1 second
i remove file_exists from the script the page executed less than 1 second 
so i bleve that the problem is in file_exists 

Reproduce code:
---------------
<?
$mokhatatpicp="../mokhatatpic/".$row[mokhatatid].".pdf";
$mokhatatpicj="../mokhatatpic/".$row[mokhatatid].".jpg";


 
if(file_exists($mokhatatpicp))
{
$mokhatatpicp="mokhatatpic/".$row[mokhatatid].".pdf";
echo"<a href=#   onclick=\"showModalDialog('../picview.hnt?myx=$mokhatatpicp&hex=embed%20'  ,'?????','width:1200;resizable: yes; help: no; status:no; scroll: no;');return false;\"  ><img src=../images/image.jpg border=0></a>";
}
elseif(file_exists($mokhatatpicj))
{
$mokhatatpicj="mokhatatpic/".$row[mokhatatid].".jpg";
echo"<a href=#   onclick=\"showModalDialog('../picview.hnt?myx=$mokhatatpicj'  ,'?????','full-screen:yes;resizable: yes; help: no; status:no; scroll: no;');return false;\"  ><img src=../images/image.jpg border=0></a>";
}
else
{echo "<img src=../images/delete.gif border=0>";}
 
?>

Expected result:
----------------
this only snippt of the code so i didnot expect any result 

Actual result:
--------------
this only snippt of the code so i didnot expect any result