[SOLVED] Thumbnail on the fly...

[dennismonsewicz]

I am trying to create a thumbnail of an image on the fly, but its not working.

 

Here is my code:

 

 // load image and get image size
	  $img = imagecreatefromjpeg( "{$url}" );
	  $width = imagesx( $img );
	  $height = imagesy( $img );

	  // calculate thumbnail size
	  $new_width = $thumbWidth;
	  $new_height = floor( $height * ( $thumbWidth / $width ) );

		header("Content-Type: image/jpeg");

	  // create a new temporary image
	  $tmp_img = imagejpeg( $new_width, $new_height );

 

 

This is my code to display the image:

 

<img src="<?php echo $tmp_img; ?>" border="0" />

 

Any help?

[dennismonsewicz]

bump

[craygo]

Use this function and put it in it's own file. say imageresize.php

 

<?php
/**********************************
*  Will resize an image to a      *
*  max width or height and keep   *
*  aspect ratio Name this file    *
*  anything you like.             *
*  I will use imageresize.php     *
**********************************/

header('Content-type: image/jpeg');
function resampleimage($maxsize, $sourcefile, $imgcomp=0)
   {
   $g_imgcomp=100-$imgcomp;
   if(file_exists($sourcefile))
       {
       $g_is=getimagesize($sourcefile);
       if($g_is[0] <= $maxsize && $g_is[1] <= $maxsize){
           $new_width=$g_is[0];
           $new_height=$g_is[1];
       } else {
       $w_adjust = ($maxsize / $g_is[0]);
       $h_adjust = ($maxsize / $g_is[1]);
        if($w_adjust <= $h_adjust)
        {
        $new_width=($g_is[0]*$w_adjust);
        $new_height=($g_is[1]*$w_adjust);
        }
        else
        {
        $new_width=($g_is[0]*$h_adjust);
        $new_height=($g_is[1]*$h_adjust);
        }
       }
       	//SEARCHES IMAGE NAME STRING TO SELECT EXTENSION (EVERYTHING AFTER . )
    $image_type = strrchr($sourcefile, ".");

    //SWITCHES THE IMAGE CREATE FUNCTION BASED ON FILE EXTENSION
	switch($image_type) {
		case '.jpg':
			$img_src = imagecreatefromjpeg($sourcefile);
			break;
		case '.png':
			$img_src = imagecreatefrompng($sourcefile);
			break;
		case '.gif':
			$img_src = imagecreatefromgif($sourcefile);
			break;
		default:
			echo("Error Invalid Image Type");
			die;
			break;
		}
       $img_dst=imagecreatetruecolor($new_width,$new_height);
       imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $new_width, $new_height, $g_is[0], $g_is[1]);
       imagejpeg($img_dst);
       imagedestroy($img_dst);
       imagedestroy($img_src);
       return true;
       }
       else
       return false;
   }
// now call the image from any other page with <img src="imageresize.php?maxsize=xxx&source=path/to/image/file" border=0 />
resampleimage($_GET['maxsize'], $_GET['source']);
?>

 

now call it like

 

<img src="imageresize.php?maxsize=xxx&source=<? echo $tmp_img; ?>" border="0" />

 

Ray

 

 

[dennismonsewicz]

do I insert my own maxsize?

[craygo]

yes. This script will keep the original aspect ratio so picture won't be distorted.

 

Ray

[dennismonsewicz]

ok sweet, next question:

 

how does this file know where to grab the sourcefile from?

[dennismonsewicz]

ok disregard what I just asked...

 

I tried your script and got nothing:

 

<?php
$imagename = $result['name'];

$imagesize = $result['size'];

$kbsize = number_format($imagesize / 1024);

$url = $result['url'];

$uploadedby = $result['username'];

$cats = $result['categories'];

$numberofdownloads = $result['number_of_downloads'];

?>
            
            <div class="maincontent">
            	<div class="maincontentheader">
                	<h2><?php echo ucwords($username); ?> here is <?php echo $imagename; ?>'s information!</h2>
                </div>
                
                	<table width="690" cellpadding="4" cellspacing="0" border="0" align="center">
                    	<tr>
                        	<td bgcolor="#dcdcdc" width="325" align="center" style="border: 1px solid #666666;"><img src="imageresize.php?maxsize=150&source=<? echo $imagename; ?>" border="0" /></td>
                            <td valign="top"><p><b>Image Name:</b> <?php echo $imagename; ?></p>
                            	<p><b>Image Size:</b> <?php echo $kbsize; ?> KB</p>
                                <p><b>Uploaded By:</b> <?php echo ucwords($uploadedby) ?></p>
                                <p><b>Categories:</b> <?php echo $cats ?></p>
                                <p><b>Number of Downloads:</b> <?php echo $numberofdownloads ?></p>
                            </td>
                        </tr>
                    </table>
                    
                <div class="maincontentfooter"> </div>
            </div>
            
<?php 
  
  	include "includes/footer.php";

?>

[cooldude832]

go toimageresize.php?maxsize=150&source=VALIDSOURCE HERE

 

and see if it is erroring via viewing its source code.

[dennismonsewicz]

I went to it in the URL, and it works, but it isn't working when i call it in the src

 

<img src="imageuploads/imageresize.php?maxsize=500&source=<? echo $imagename; ?>" border="0" />

[cooldude832]

check your source code to make sure your image is a valid image location

[dennismonsewicz]

my server is setup to use <?php not <?