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Posted By

oso96_2000 on 02/11/07


Tagged

php image gd thumbnail


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luman
vali29


function thumb

 / Published in: PHP
 

With this function you can make a thumbnail from an image. Usage: $image = "something.jpg"; thumb($image, 100, 100);

It can be easy modified to accept other types of images, actually only support jpeg, gif and png. Gif images lost their animation, and png or gif image lost their transparency.

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  1. <?php
  2. function thumb($img, $w, $h, $fill = true) {
  3.   if (!extension_loaded('gd') && !extension_loaded('gd2')) {
  4. 		trigger_error("No dispones de la libreria GD para generar la imagen.", E_USER_WARNING);
  5. 		return false;
  6. 	}
  7.  
  8.   //$ext = strtolower(array_pop(explode(".",$img)));
  9.   $imgInfo = getimagesize($img);
  10.   switch ($imgInfo[2]) {
  11.     case 1: $im = imagecreatefromgif($img); break;
  12.     case 2: $im = imagecreatefromjpeg($img);  break;
  13.     case 3: $im = imagecreatefrompng($img); break;
  14.     default:  trigger_error('Tipo de imagen no reconocido.', E_USER_WARNING);  break;
  15.   }
  16.  
  17.   if ($imgInfo[0] <= $w && $imgInfo[1] <= $h && !$fill) {
  18.     $nHeight = $imgInfo[1];
  19.     $nWidth = $imgInfo[0];
  20.   }else{
  21.     if ($w/$imgInfo[0] < $h/$imgInfo[1]) {
  22.       $nWidth = $w;
  23.       $nHeight = $imgInfo[1]*($w/$imgInfo[0]);
  24.     }else{
  25.       $nWidth = $imgInfo[0]*($h/$imgInfo[1]);
  26.       $nHeight = $h;
  27.     }
  28.   }
  29.  
  30.   $nWidth = round($nWidth);
  31.   $nHeight = round($nHeight);
  32.  
  33.   $newImg = imagecreatetruecolor($nWidth, $nHeight);
  34.  
  35.   imagecopyresampled($newImg, $im, 0, 0, 0, 0, $nWidth, $nHeight, $imgInfo[0], $imgInfo[1]);
  36.  
  37.   header("Content-type: ". $imgInfo['mime']);
  38.  
  39.   switch ($imgInfo[2]) {
  40.     case 1: imagegif($newImg); break;
  41.     case 2: imagejpeg($newImg);  break;
  42.     case 3: imagepng($newImg); break;
  43.     default:  trigger_error('Imposible mostrar la imagen.', E_USER_WARNING);  break;
  44.   }
  45.  
  46.   imagedestroy($newImg);
  47. }
  48. ?>

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