PHP uses GD to create a way to keep the aspect ratio thumbnail _php tips

The example in this article describes how PHP uses GD to create a way to maintain a wide-ratio thumbnail. Share to everyone for your reference. as follows:

/** * Create a thumbnail image from $inputFileName no taller or wider than * $maxSize.
Returns the new image resource or false on error.
  * Author:mthorn.net/function thumbnail ($inputFileName, $maxSize = m) {$info = getimagesize ($inputFileName); $type = Isset ($info [' type '])?
  $info [' type ']: $info [2]; Check support of file type if (!) (
 Imagetypes () & $type)) {//Server does not support file type return false; $width = Isset ($info [' width '])?
 $info [' width ']: $info [0]; $height = Isset ($info [' height '])?
  $info [' Height ']: $info [1];
 Calculate aspect ratio $wRatio = $maxSize/$width;
  $hRatio = $maxSize/$height; Using imagecreatefromstring would automatically detect the file type $sourceImage = imagecreatefromstring (file_get_cont
  Ents ($inputFileName));
 Calculate a proportional width and height no larger than the max size. if ($width <= $maxSize) && ($height <= $maxSize)) {//Input is smaller than thumbnail, do Nothing return $sourceImage;
   } elseif ($wRatio * $height) < $maxSize) {//Image is horizontal $tHeight = ceil ($wRatio * $height);
 $tWidth = $maxSize;
   else {//Image is vertical $tWidth = ceil ($hRatio * $width);
 $tHeight = $maxSize;
  } $thumb = Imagecreatetruecolor ($tWidth, $tHeight);
 if ($sourceImage = = False) {//Could not load image return false; }//Copy resampled makes a smooth thumbnail imagecopyresampled ($thumb, $sourceImage, 0,0,0,0, $tWidth, $tHeight, $width, $h
 eight);
  Imagedestroy ($sourceImage);
return $thumb; }/** * Save the image to a file.
The Type is determined from the extension.
* $quality is only used for JPEGs.
   * Author:mthorn.net/function Imagetofile ($im, $fileName, $quality =) {if (! $im | | | file_exists ($fileName)) {
 return false;
  $ext = Strtolower (substr ($fileName, Strrpos ($fileName, '. '));
  Switch ($ext) {case '. gif ': Imagegif ($im, $fileName);
  Break Case '. jpg ': case '. jpeg ': ImageJPeg ($im, $fileName, $quality);
  Break
  Case '. png ': Imagepng ($im, $fileName);
  Break
  Case '. bmp ': Imagewbmp ($im, $fileName);
  Break
 Default:return false;
return true;
$im = Thumbnail (' temp.jpg ', 100); Imagetofile ($im, ' temp-thumbnail.jpg ');

I hope this article will help you with your PHP programming.