- /**
- * 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 = 100)
- {
- $info = getimagesize($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 will automatically detect the file type
- $sourceImage = imagecreatefromstring(file_get_contents($inputFileName));
-
- // Calculate a proportional width and height no larger than the max size.
- if ( ($width {
- // Input is smaller than thumbnail, do nothing
- return $sourceImage;
- }
- elseif ( ($wRatio * $height) {
- // 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, $height);
- imagedestroy($sourceImage);
-
- return $thumb;
- }
-
- /**
- * Save the image to a file. Type is determined from the extension.
- * $quality is only used for jpegs.
- * Author: mthorn.net
- */
- function imageToFile($im, $fileName, $quality = 80)
- {
- if ( !$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');
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