I have to add an image from a folder - IMG SRC the database

I have to add an image which is saved in a folder.
The folder and name are specified in the database in the $path field.
I want to not display anything if there is no data in the $path field.
And to display the image if the address is specified in $path.

This code is not working...don't know why...

<img src='<? if (!$path) { } else { echo $path } ?>'>

if($path)
echo "<img src=\"{$path}\" alt=\"\"/>"; ?

<?php echo trim($path) != '' ? '<img src="'.$path.'" alt="">' : ''; ?>

I got syntax errors because of ".