在PHP中创建temporay拇指图像

Question

Hey, i am looking for a method to creat temporay thumb file in PHP. Is there any way not to store the image on the server or delete them right after. What I am looking for is a solution like this: http://www.dig2go.com/index.php?shopbilde=772&type=1&size=120

Could some one explain to me how the php code behind this works? For the moment are am using a php code I found on the net for creation of thumb nails:

function createThumb($pathToImage, $pathToThumb, $thumbWidth, $thumbHeight,    $saveNameAndPath)
{
   if(!file_exists($pathToImage))
   return false;

   else
   {
      //Load image and size
      $img = imagecreatefromjpeg($pathToImage);
      $width = imagesx($img);
      $height = imagesy($img);

      //Calculate the size of thumb
      $new_width = $thumbWidth;
      $new_height = $thumbHeight; //floor($height * ($thumbWidth / $width));

      //Make the new thumb
      $tmp_img = imagecreatetruecolor($new_width, $new_height);

      //Copy the old image and calculate the size
      imagecopyresized($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

      //Save the thumb to jpg 
      imagejpeg($tmp_img, $saveNameAndPath);

      return true;
    }
}

Answer 1

function createThumb($pathToImage, $pathToThumb, $thumbWidth, $thumbHeight, $saveNameAndPath) { if(!file_exists($pathToImage)) return false;

   else
   {
      //Load image and size
      $img = imagecreatefromjpeg($pathToImage);
      $width = imagesx($img);
      $height = imagesy($img);

      //Calculate the size of thumb
      $new_width = $thumbWidth;
      $new_height = $thumbHeight; //floor($height * ($thumbWidth / $width));

      //Make the new thumb
      $tmp_img = imagecreatetruecolor($new_width, $new_height);

      //Copy the old image and calculate the size
      imagecopyresized($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
      // sets the header and creates the temporary thumbnail
      // ideal for ajax requests / <img> elements
      header("Content-type: image/jpeg");
      imagejpeg($img);

      return true;
    }
}

Answer 2

You can use ini_set("memory_limit","12M"); to set memory limit in your script. You can extend it from 12 megabytes to maximum memory you have.

Generally 64M is good.