Site 1 - showrandomimg plugin

<?php
/*
Plugin Name: ShowRandomImg
Plugin URI: http://howlingwolfmedia.com/site1
Description: This function scans thru the directory received and loads the image files names into an array; Then returns a random name to the caller
Version: 1.0
Author: Flavio de Pecol
Author URI: http://howlingwolfmedia.com
License: GPL2
*/

    function  GetImageName($DirName)
            {
             $file = 'debugtrace.txt';
             $Img = array();  // define array

             // image types accepted:  jpg png gif
             //$ImgPath = $DirName . '/' . '{*.jpg,*.gif,*.png}';
             $ImgPath = $DirName . '/' . '*.jpg';


             file_put_contents($file, $ImgPath); // Write trace

             //$Img = glob($ImgPath, GLOB_BRACE);
             $Img = glob($ImgPath);

            /* foreach (glob($ImgPath, GLOB_BRACE) as $filename)
             {
              if (is_readable($filename))
                    $Img[]  = $filename;  // found image file
             }
             */

             file_put_contents($file, $Img, FILE_APPEND ); // Write trace

             $Imgcount = sizeof($Img) - 1; // the index is zero-based
             if ($Imgcount <= 0)
                return "/wp-content/themes/custom/img/rotatepics/pic1.jpg";
             else
             {
              $rand_image_ix = rand(0,$Imgcount);
              return $Img[$rand_image_ix];  // return name of image
             }
    }


            // function to print the random image

    function ShowRandomImg($size_x=300, $size_y=228)
            {
             $DirNm = "/wp-content/themes/custom/img/rotatepics";  // current directory

             if (is_front_page() || is_page('contact') )
             {
              $DirNm = $DirNm  . "/contact";
              $ImgNm = GetImageName($DirNm);  // retrieve random image from directory "contact"
             }
             elseif (is_page('references') )
             {
              $DirNm = $DirNm  . "/references";
              $ImgNm = GetImageName($DirNm);  // retrieve random image from directory "references"
             }
             elseif (is_page('services') )
             {
              $DirNm = $DirNm  . "/services";
              $ImgNm = GetImageName($DirNm);  // retrieve random image from directory "services"
             }
             else
             {
              $ImgNm = GetImageName($DirNm);  // retrieve random image from current directory
             }


             $file = 'debugtrace.txt';
             file_put_contents($file, $DirNm, FILE_APPEND ); // Write trace
             file_put_contents($file, $ImgNm, FILE_APPEND ); // Write trace

             $ImgTag =  '<img src="' . $ImgNm . '" width="' . $size_x . '" height="' . $size_y . '"  alt="' . $ImgNm . '">';
             file_put_contents($file, $ImgTag, FILE_APPEND ); // Write trace

             echo $ImgTag;

            $content = ob_get_contents();
            ob_end_clean();
            return $content;
            }

            add_shortcode("ShowRandomImg", "ShowRandomImg");
 ?>