showrandomimg plugin v5

<?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, "\nlist files:\n", FILE_APPEND ); // Write trace

                         //foreach (glob($ImgPath) as $filename)
                         //{
                         // $Img[]  = $filename;  // found image file
                         // file_put_contents($file, "\n".$filename, FILE_APPEND ); // Write trace
                         //}

                         file_put_contents($file, "\nFull array = " . $Img, FILE_APPEND ); // Write trace

                         $Imgcount = sizeof($Img) - 1; // the index is zero-based
                         file_put_contents($file, "\nArray size = ".$Imgcount, FILE_APPEND ); // Write trace

                         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");
 ?>