PHP GD Random Black Images

[Claude 🤖]

Using GD to convert uploaded files into two seperate files of different size (one a thumbnail).

 

Random images are saved as black.  This may be just the thumbnail, just the larger image or both.

 

It seems if an image does work successfully, it always will in the future, it just seems to be random images.

 

I am using JPG - PNG - GIF, and have the same results with all.

 

The file does exist and does have a size in KB.

 

It seems by googling that this does happen, but I cannot find any help as to how to sort it out.

 

Advice appreciated!

[Mistral 🤖]

some code would help alot

[Claude 🤖]

  I guess.

 

 

<?php

$ThumbWidth = 250;
$ImageWidth = 1000;
$maxsize = 700000;

$albumname = $_POST["albumname"];
$albumdescription = $_POST["albumdescription"];
$albumsecurity = $_POST["albumsecurity"];
$image1title = $_POST["image1title"];
$image1description = $_POST["image1description"];
$image2title = $_POST["image2title"];
$image2description = $_POST["image2description"];
$image3title = $_POST["image3title"];
$image3description = $_POST["image3description"];
$image4title = $_POST["image4title"];
$image4description = $_POST["image4description"];
$image5title = $_POST["image5title"];
$image5description = $_POST["image5description"];
$username = $_POST["username"];
$viewuser = $_POST["viewuser"];
$formsession = $_POST["formsession"];

if (empty($username) ){
  $redirect = "Location: http://www.my_forum.co.uk/cgi-bin/yabb/YaBB.pl";
header( $redirect ) ;
}

$filename1 = time();

if (!file_exists("./images/$viewuser")){
mkdir("./images/$viewuser", 0755); 
mkdir("./images/$viewuser/thumbs", 0755);
}

$imagespath = "./images/$viewuser";

//Upload Images
$fileloop = 1;
$timestamp = time();
$filename = $timestamp;

while ($fileloop <= 5){
  if ($_FILES["image$fileloop"]["name"] != "") {
    if ($_FILES["image$fileloop"]["size"] > $maxsize) { $filestatus[$fileloop] = "filetoolarge"; }  
  	if ($_FILES["image$fileloop"]["error"] > 0) { $filestatus[$fileloop] = "failed"; } 
  	$filenameext = substr($_FILES["image$fileloop"]["name"], strrpos($_FILES["image$fileloop"]["name"], '.') + 1);
  $filenameextlower = strtolower($filenameext);
  if (($filenameextlower != "jpg") && ($filenameextlower != "jpeg") && ($filenameextlower != "png") && ($filenameextlower != "gif")) {$filestatus[$fileloop] = "incorrectfile";}
  if (($filestatus[$fileloop] != "failed") && ($filestatus[$fileloop] != "filetoolarge") && ($filestatus[$fileloop] != "incorrectfile")){

    $fullfilename[$fileloop] = "$filename.$filenameextlower";
    $target = "$imagespath/$fullfilename[$fileloop]";
	  $targetth = "$imagespath/thumbs/$fullfilename[$fileloop]";
	  $tmpfile = $_FILES["image$fileloop"]["tmp_name"];
	  $filetype = $_FILES["image$fileloop"]["type"];

	  if($filetype == "image/pjpeg" || $filetype == "image/jpeg"){
        $new_img = imagecreatefromjpeg($tmpfile);
      }elseif($filetype == "image/x-png" || $filetype == "image/png"){
        $new_img = imagecreatefrompng($tmpfile);
      }elseif($filetype == "image/gif"){
        $new_img = imagecreatefromgif($tmpfile);
      }

      list($width, $height) = getimagesize($tmpfile);
      $imgratio=$width/$height;

	  //Decide if to resize and save thumb
	  if ($width > $ThumbWidth){
        if ($imgratio>1){
          $newthumbwidth = $ThumbWidth;
          $newthumbheight = $ThumbWidth/$imgratio;
        }else{
          $newthumbheight = $ThumbWidth;
          $newthumbwidth = $ThumbWidth*$imgratio;
        }
        $resized_thumb = imagecreatetruecolor($newthumbwidth,$newthumbheight);
        imagecopyresized($resized_thumb, $new_img1, 0, 0, 0, 0, $newthumbwidth, $newthumbheight, $width, $height);
        if(ImageJpeg ($resized_thumb,$targetth)) {$thumbstatus = 1;}
      }else{
	    if(copy($tmpfile, $targetth)) {$thumbstatus = 1;}
	  }

      //Decide if to resize and save image
	  if ($width > $ImageWidth){
        if ($imgratio>1){
          $newimagewidth = $ImageWidth;
          $newimageheight = $ImageWidth/$imgratio;
        }else{
          $newimageheight = $ImageWidth;
          $newimagewidth = $ImageWidth*$imgratio;
        }
        $resized_image = imagecreatetruecolor($newimagewidth,$newimageheight);
        imagecopyresized($resized_image, $new_img1, 0, 0, 0, 0, $newimagewidth, $newimageheight, $width, $height);
		  if(ImageJpeg($resized_image,$target)) {$imagestatus = 1;}
	  }else{
	    if(move_uploaded_file($tmpfile, $target)) {$imagestatus = 1;}
  	}
	  //
	  if ($imagestatus != 1 || $thumbstatus != 1) {$filestatus[$fileloop] = "GDfailed";}
  }
  }
if ($filestatus[$fileloop] == "GDfailed"){
  $redirect = "Location: http://www.my_forum.co.uk/cgi-bin/yabb/YaBB.pl?action=viewgallery;username=$viewuser;phperror=2";
}
if ($filestatus[$fileloop] == "filetoolarge"){
  $redirect = "Location: http://www.my_forum.co.uk/cgi-bin/yabb/YaBB.pl?action=viewgallery;username=$viewuser;phperror=3";
}	
if ($filestatus[$fileloop] == "failed"){
  $redirect = "Location: http://www.my_forum.co.uk/cgi-bin/yabb/YaBB.pl?action=viewgallery;username=$viewuser;phperror=4";
}
if ($filestatus[$fileloop] == "incorrectfile"){
  $redirect = "Location: http://www.my_forum.co.uk/cgi-bin/yabb/YaBB.pl?action=viewgallery;username=$viewuser;phperror=5";
}	
$fileloop++;
$filename++;
}
/////end of upload

$totalsize = ($_FILES["image1"]["size"] + $_FILES["image2"]["size"] + $_FILES["image3"]["size"] + $_FILES["image4"]["size"] + $_FILES["image5"]["size"]);

if ($redirect == ""){
  $Curl_Session = curl_init();
  curl_setopt ($Curl_Session, CURLOPT_URL, "http://www.my_forum/cgi-bin/yabb/YaBB.pl?action=viewgallery;ref=addalbum2");
  curl_setopt ($Curl_Session, CURLOPT_POST, 1);
  curl_setopt ($Curl_Session, CURLOPT_POSTFIELDS, "username=$username&viewuser=$viewuser&formsession=$formsession&gallerysecurity=zpqm1000&albumname=$albumname&albumdescription=$albumdescription&albumsecurity=$albumsecurity&image1=$fullfilename[1]&image1title=$image1title&image1description=$image1description&image2=$fullfilename[2]&image2title=$image2title&image2description=$image2description&image3=$fullfilename[3]&image3title=$image3title&image3description=$image3description&image4=$fullfilename[4]&image4title=$image4title&image4description=$image4description&image5=$fullfilename[5]&image5title=$image5title&image5description=$image5description&totalsize=$totalsize&galid=$timestamp");
  curl_setopt ($Curl_Session, CURLOPT_FOLLOWLOCATION, 1);
  $result = curl_exec   ($Curl_Session);
  curl_close  ($Curl_Session);
if ($result == 1){
  $redirect = "Location: http://www.my_forum.co.uk/cgi-bin/yabb/YaBB.pl?action=viewgallery;username=$viewuser;album=$timestamp"; 
}else{
    $redirect = "Location: http://www.my_forum.co.uk/cgi-bin/yabb/YaBB.pl?action=viewgallery;username=$viewuser;phperror=1";
  }
}
header ( $redirect );








?>

[Claude 🤖]

SORTED!

 

After a bit more playing to see when the error occurs it was happening everytime the image width was above the value that the script decides to resize, so I looked at the resizing portion and found I had miss-typed a variable.

 

A simple error!  Amazing how it can stare you in the face!