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Tell this code to assign a random name to the uploaded image

Posted: Fri Jul 23, 2010 1:06 pm
by tom8521
I have some code which works by uploading an image from the clients machine, and then making a thumbnail of that image also.
Can anyone on here read through the code and add in something to make the uploaded image a randomly generated name?
Thanks!

Code: Select all

<?php
$idir = "images/";   // Path To Images Directory
$tdir = "images/thumbs/";   // Path To Thumbnails Directory
$twidth = "125";   // Maximum Width For Thumbnail Images
$theight = "100";   // Maximum Height For Thumbnail Images

if (!isset($_GET['subpage'])) {   // Image Upload Form Below   ?>
  <form method="post" action="addphoto.php?subpage=upload" enctype="multipart/form-data">
   File:<br />
  <input type="file" name="imagefile" class="form">
  <br /><br />
  <input name="submit" type="submit" value="Sumbit" class="form">  <input type="reset" value="Clear" class="form">
  </form>
<? } else  if (isset($_GET['subpage']) && $_GET['subpage'] == 'upload') {   // Uploading/Resizing Script
  $url = $_FILES['imagefile']['name'];   // Set $url To Equal The Filename For Later Use
  if ($_FILES['imagefile']['type'] == "image/jpg" || $_FILES['imagefile']['type'] == "image/jpeg" || $_FILES['imagefile']['type'] == "image/pjpeg") {
    $file_ext = strrchr($_FILES['imagefile']['name'], '.');   // Get The File Extention In The Format Of , For Instance, .jpg, .gif or .php
    $copy = copy($_FILES['imagefile']['tmp_name'], "$idir" . $_FILES['imagefile']['name']);   // Move Image From Temporary Location To Permanent Location
    if ($copy) {   // If The Script Was Able To Copy The Image To It's Permanent Location
      print 'Image uploaded successfully.<br />';   // Was Able To Successfully Upload Image
      $simg = imagecreatefromjpeg("$idir" . $url);   // Make A New Temporary Image To Create The Thumbanil From
      $currwidth = imagesx($simg);   // Current Image Width
      $currheight = imagesy($simg);   // Current Image Height
      if ($currheight > $currwidth) {   // If Height Is Greater Than Width
         $zoom = $twidth / $currheight;   // Length Ratio For Width
         $newheight = $theight;   // Height Is Equal To Max Height
         $newwidth = $currwidth * $zoom;   // Creates The New Width
      } else {    // Otherwise, Assume Width Is Greater Than Height (Will Produce Same Result If Width Is Equal To Height)
        $zoom = $twidth / $currwidth;   // Length Ratio For Height
        $newwidth = $twidth;   // Width Is Equal To Max Width
        $newheight = $currheight * $zoom;   // Creates The New Height
      }
      $dimg = imagecreate($newwidth, $newheight);   // Make New Image For Thumbnail
      imagetruecolortopalette($simg, false, 256);   // Create New Color Pallete
      $palsize = ImageColorsTotal($simg);
      for ($i = 0; $i < $palsize; $i++) {   // Counting Colors In The Image
       $colors = ImageColorsForIndex($simg, $i);   // Number Of Colors Used
       ImageColorAllocate($dimg, $colors['red'], $colors['green'], $colors['blue']);   // Tell The Server What Colors This Image Will Use
      }
      imagecopyresized($dimg, $simg, 0, 0, 0, 0, $newwidth, $newheight, $currwidth, $currheight);   // Copy Resized Image To The New Image (So We Can Save It)
      imagejpeg($dimg, "$tdir" . $url);   // Saving The Image
      imagedestroy($simg);   // Destroying The Temporary Image
      imagedestroy($dimg);   // Destroying The Other Temporary Image
      print 'Image thumbnail created successfully.';   // Resize successful
    } else {
      print '<font color="#FF0000">ERROR: Unable to upload image.</font>';   // Error Message If Upload Failed
    }
  } else {
    print '<font color="#FF0000">ERROR: Wrong filetype (has to be a .jpg or .jpeg. Yours is ';   // Error Message If Filetype Is Wrong
    print $file_ext;   // Show The Invalid File's Extention
    print '.</font>';
  }
} ?>

Re: Tell this code to assign a random name to the uploaded i

Posted: Fri Jul 23, 2010 1:16 pm
by Jade
This is a forum for learning, not a place where we just create and modify your code for free. You should try to code it yourself first then post your code when you run into errors so we can help you jump over the hurdle.

Take a look at some of these PHP functions, they should get you pointed in the right direction.

http://us2.php.net/manual/en/function.chr.php
http://us2.php.net/manual/en/function.rand.php
http://www.asciitable.com/

The code you posted is well documented, you shouldn't have much trouble figuring it out but here's one tip, take a look at this line:

Code: Select all

$copy = copy($_FILES['imagefile']['tmp_name'], "$idir" . $_FILES['imagefile']['name']);   // Move Image From Temporary Location To Permanent Location