- php教程首页
- php图像处理
php生成缩略图代码
•php图像处理•阅读 311 - <?php
- # Constants
- define("IMAGE_BASE", './');
- define("MAX_WIDTH", 150);
- define("MAX_HEIGHT", 150);
- # Get image locationstr_replace('..', '', $_SERVER['QUERY_STRING']);
- $image_file = 't.jpg';
- $image_path = IMAGE_BASE . "$image_file";
- # Load image
- $img = null;
- $ext = strtolower(end(explode('.', $image_path)));
- if ($ext == 'jpg' || $ext == 'jpeg') {
- $img = imagecreatefromjpeg($image_path);
- } else if ($ext == 'png') {
- $img = @imagecreatefrompng($image_path);
- # Only if your version of GD includes GIF support
- } else if ($ext == 'gif') {
- $img = @imagecreatefrompng($image_path);
- }
- # If an image was successfully loaded, test the image for size
- if ($img) {
- # Get image size and scale ratio
- $width = imagesx($img);
- $height = imagesy($img);
- $scale = min(MAX_WIDTH/$width, MAX_HEIGHT/$height);
- # If the image is larger than the max shrink it
- if ($scale < 1) {
- $new_width =150; //floor($scale*$width);
- $new_height =150;// floor($scale*$height);
- # Create a new temporary image
- $tmp_img = imagecreatetruecolor($new_width, $new_height);
- # Copy and resize old image into new image
- imagecopyresized($tmp_img, $img, 0, 0, 0, 0,$new_width, $new_height, $width, $height);
- imagedestroy($img);
- $img = $tmp_img;
- }
- }
- # Create error image if necessary
- if (!$img) {
- $img = imagecreate(MAX_WIDTH, MAX_HEIGHT);
- imagecolorallocate($img,0,0,0);
- $c = imagecolorallocate($img,70,70,70 );
- imageline($img,0,0,MAX_WIDTH,MAX_HEIGHT,$c2);
- imageline($img,MAX_WIDTH,0,0,MAX_HEIGHT,$c2);
- }//开源代码phpfensi.com
- # Display the image
- header("Content-type: image/jpeg");
- imagejpeg($img);
- imagedestroy($img);
- ?>