Directories, Files and Images

Part:   1  2  3 

(Continued from previous part...)

• imagecolorallocate -- Allocate a color for an image
• imagecolorat -- Get the index of the color of a pixel
• imagecolorexact -- Get the index of the specified color
• imagecolorsforindex -- Get the colors for an index
• imagecolorstotal -- Find out the number of colors in an image's palette
• imagecolortransparent -- Define a color as transparent
• imagecopy -- Copy part of an image
• imagecopymerge -- Copy and merge part of an image
• imagecopyresized -- Copy and resize part of an image
• imagecreatefromgif -- Create a new image from file or URL
• imagecreatefromjpeg -- Create a new image from file or URL
• imagecreatefromwbmp -- Create a new image from file or URL
• imagedestroy -- Destroy an image
• imagefill -- Flood fill
• imagefilledarc -- Draw a partial ellipse and fill it
• imagefilledrectangle -- Draw a filled rectangle
• imagefilltoborder -- Flood fill to specific color
• imagefttext -- Write text to the image using fonts using FreeType 2
• imagegif -- Output image to browser or file
• imagejpeg -- Output image to browser or file
• imageline -- Draw a line
• imageloadfont -- Load a new font
• imagepolygon -- Draw a polygon
• imagerectangle -- Draw a rectangle
• imagesetpixel -- Set a single pixel
• imagestring -- Draw a string horizontally
• imagesx -- Get image width
• imagesy -- Get image height
• imagettftext -- Write text to the image using TrueType fonts
• imagewbmp -- Output image to browser or file
• jpeg2wbmp -- Convert JPEG image file to WBMP image file
• png2wbmp -- Convert PNG image file to WBMP image file

ShowPhoto.php - Showing Images in a Directory

To show you how to use functions directories, files, and images, I wrote the following sample program:

<?php # PhotoShow.php
# Copyright (c) 2003 by Dr. Herong Yang, http://www.herongyang.com/
# 
#- Get the photo file name
   $i = intval($_GET['i']);
   $c = 0;
   $p = "";
   if ($d = opendir(".")) {
      while (($f = readdir($d)) != false) {
      	 if (preg_match('/.jpg$/',$f)) {
            if ($i==$c) {
               $p = $f;
            }
            $c++;
         }
      }
      closedir($d);
    }

#- Build the page
   $h = fopen("header.html", "r");
   $s = fread($h, filesize("header.html"));
   fclose($h);
   print "$s\n";

   if (strlen($p)>0) {
      $i1 = ($i+$c-1) % $c;
      $i2 = ($i+$c+1) % $c;
      list($width, $height, $type, $attr) = getimagesize($p);
      if ($width>700) {
         $width = $width/2;
         $height = $height/2;
      }
      print "<center><a href=\"ShowPhoto.php?i=$i1\"><=</a>&nbsp;"
         ."<a href=\"ShowPhoto.php?i=$i2\">=></a></center>\n"
         ."<center><img src=\"$p\" border=\"1\" width=\"$width\" "
         ."height=\"$height\"></center><br\>\n"
         ."<center><a href=\"ShowPhoto.php?i=$i1\"><=</a>&nbsp;"
         ."<a href=\"ShowPhoto.php?i=$i2\">=></a></center>\n";
   } else {
      print "<p>Wrong URL. Please go back to the home page.</p>\n";
   }
   
   $h = fopen("footer.html", "r");
   $s = fread($h, filesize("footer.html"));
   fclose($h);
   print "$s\n";
?>

Try it out. It's very easy to use. You can easily customize it to meet your requirements.

Part:   1  2  3