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How to tell php I do not want any directories only files?

Last Modified: 2012-05-11
In some of my directories I do not only have image files but other directories and I do not want my code to attempt to produce image tags out of them.  So I tried:

if(!is_dir($style)) {
            foreach($style as $img) {
            echo "<img src=\"" . $data . "/" . $img . "\" />";

but it still products img tags with the directory names, which obviously are not images.  Anyone know how to tell php to only uses files and not directories?
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