Restricting image width & height ...?!

Anon

Hi,

I'm working on a phorum where I want 2 show userphoto's within a certain profile, but I want 2 limit them on width and height.

So, for example, a user gives a url of a photo that's 200x300 pix. in size and let's say I want to restrict it to a maximum of <U>200x200</u>, is that possible?

...but then when a user gives a url for a photo that's smaller then <u>200x200</u>, it must be shown as normal...

A helping hand would be appreciated.

Thx, Jeroen

amcgrath

why not resize it in the html and be done with it?

edwardsbc

Look into the function GetImageSize.

<http://www.php.net/manual/en/function.getimagesize.php>

With this, you can test the image size and use code logic to modify the height/width parameters in the HTML IMG tag.

As of PHP 4.0.5 the function works with URLs as well.

edwardsbc

He may be concerned about maintaining aspect ratios and the like....

Anon

Here is a quick function I wrote up. It doesn't resize the image on the server side, but resizes the image in the HTML <img> tag. You should also take a look at the GetImageSize() function (). Here is the function I wrote

/ BEGIN /
function printImageHTML($file) {
   $information = GetImageSize($file);
   // $information[0] = Width
   // $information[1] = Height

   if($information[0] > 200)
      $width = 200;
   else
      $width = $information[0];

   if($information[1] > 200)
      $height = 200;
   else
      $height = $information[1];

   return "<img src=\"$file\" width=\"$width\" height=\"$height\" border=\"1\" bordercolor=\"#000000\">";
}

echo printImageHTML("bigimage.jpg");
/ END /

Hope this helps get you started.

-Josh B

Anon

Thx 4 your trouble,

I'm working on it, trying a few things...

Jeroen.

jjoske

You shouldn't really resize the image on the HTML side. Why don't you have a look at the following functions
imagecreate
imagesx
imagesy
imagecopyresized

They will allow you to test the image size and if it is to big create a smaller image.

Anon

Some people don't have GD installed on their system, so it is best to not rely on it. Also resizing on the browser side saves the server some load time...

jjoske

If you resize it on the server when the picture is first uploaded then you only have to do it once. One of the problems with resizing it on the browser is that some one could some one could up load a huge picture which the server would send the browser which could be pretty annoying to some with a slow connection.

Anon

Okay,

I got it working fine with GetImageSize(). The images are not on my server, so they're just loaded from somewhere else.

(and most of the time, the images will not be that big, but I know that by this way, the whole image has to load.)

I restricted them; width 560 / height 500, so they fit fine in a table I made for the forum, but I've got only one problem, that is, that when a picture doesn't exist, the output stalls.

so, I've got something like this:
/
Foto,plaatje beperken in breedte,hoogte.
*/
function printImageHTML($imagefile) {

$information = GetImageSize($imagefile);
// $information[0] = Width
// $information[1] = Height

if($information[0] > 560)
$width = 560;
else
$width = $information[0];

if($information[1] > 500)
$height = 500;
else
$height = $information[1];

return "<img src=\"$imagefile\" width=\"$width\" height=\"$height\" border=\"0\">";
}

So when $imagefile does NOT exist... it stalls.

Anon

Hmm, just thinking out loud;

I could check each file with something like this:

<?
//Show debug information on screen (for testing purposes)
$DEBUG = 0;

//Function to check for a file on another http server
function checkfile($servername, $filelocation, $portnumber = 80, $timeout = 30)
{
$fp = fsockopen ($servername, $portnumber, &$errno, &$errstr, $timeout);

if (!$fp)
return -1; //Function failed;
else
{
fputs ($fp, "HEAD http://".$servername.$filelocation." HTTP/1.0\n\n");//\nHOST: ".$servername."\n\n");
while (!feof($fp))
$string .= fgets ($fp,128);
fclose ($fp);

if($DEBUG)
echo $string.'<hr>';

if (stristr($string, "200 OK"))
return 1;
else
return 0;
}
}

//Example code.
$server = 'oglchallenge.otri.net';
$file = '/robots.txt';
switch(checkfile($server,$file))
{
case 1: echo 'File Exists.';break;
case 0: echo 'File does not exist.';break;
case -1: echo 'Function Failed.';break;
}
?>

But isn't there a more easy way? :-/

Anon

I believe you can check if a remote file exists simply by trying to open it for reading (using fopen())... Here is an example:
/ BEGIN CODE /
function checkRemoteFileExists($file) {
$fp = @fopen($file,"r");
if($fp) {
fclose($fp);
return TRUE;
} else {
return FALSE;
}
}

$imageFile = "http://www.somewhere.com/image.gif";

if(checkRemoteFileExists($imageFile)) {
echo "Valid File";
} else {
echo "Invalid File";
}
/ END CODE /

A bit shorter and doesn't rely on the socket functions. Hope that helps some more 🙂

-Josh B

Anon

Thx!

I'm working on this one, thx 4 your help.