hide and show div on click

[goat man]

I have the following php code:

        $files = glob('martingallery/*');
        natcasesort($files);
        
        foreach($files as $file){
            echo '<a href="' . $file . '"><img src="' . $file . '" height="150px" width="auto"/></a>';
        } 

what I would like it to look like:

        $files = glob('martingallery/*');
        natcasesort($files);
        
        foreach($files as $file){
            echo '<a onclick="SET THE $FILE DIV TO VISIBLE"><img src="' . $file . '" height="150px" width="auto"/></a>
<div id="' . $file . '" style="visible:noooooooooo;"><img src="' . $file . '" height="auto" width="auto"/></div>';
        }