I am testing the file format of an image to upload. For some reason it is stil passing as file not in the list

$testimgformat=explode('.',$img1_name);
$imgformat=$testimgformat[sizeof($testimgformat)-1];
if (!($imgformat==jpg) || !($imgformat==gif) || !($imgformat==JPG) || !($imgformat==GIF) || !($imgformat==bmp) || !($imgformat==BMP))
{$er=$er+1;
echo "<center><font color='red'>Your file must be of jpg, bmp or gif format.</font><br></center>";}

Any help appreciated.

the extensions should be in quotes for a start

got it!

$testimgformat=explode('.',$img1_name);
$imgformat=strtolower($testimgformat[sizeof($testimgformat)-1]);
if (($imgformat != "jpg") && ($imgformat != "jpeg") && ($imgformat != "bmp") && ($imgformat != "gif") && ($imgformat != "png"))
{$er=$er+1;
echo "<center><font color='red'>Your file must be of jpg, bmp, png or gif format.</font><br></center>";}

Php already has the function Pathinfo http://uk3.php.net/pathinfo. This will return an array which includes the file extension.

Also as your files are image files only then you should be using getimagesize http://uk.php.net/manual/en/function.getimagesize.php . This will return an array including mimetype such as [mime] => image/jpeg. If file is not an image then FALSE is returned.