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- <?php
-
- $pic_name=date("dMYHis");
-
- // 生成图片的宽度
- $pic_width=$_POST['width'];
-
- // 生成图片的高度
- $pic_height=$_POST['length'];
-
- function ResizeImage($im,$maxwidth,$maxheight,$name){
- //取得当前图片大小
- $width = imagesx($im);
- $height = imagesy($im);
- //生成缩略图的大小
- if(($width > $maxwidth) || ($height > $maxheight)){
- $widthratio = $maxwidth/$width;
- $heightratio = $maxheight/$height;
- if($widthratio < $heightratio){
- $ratio = $widthratio;
- }else{
- $ratio = $heightratio;
- }
- $newwidth = $width * $ratio;
- $newheight = $height * $ratio;
-
- if(function_exists("imagecopyresampled")){
- $newim = imagecreatetruecolor($newwidth, $newheight);
- imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
- }else{
- $newim = imagecreate($newwidth, $newheight);
- imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
- }
- ImageJpeg ($newim,$name . ".jpg");
- ImageDestroy ($newim);
- }else{
- ImageJpeg ($im,$name . ".jpg");
- }
- }
-
- if($_FILES['image']['size']){
- //echo $_FILES['image']['type'];
- if($_FILES['image']['type'] == "image/pjpeg"||$_FILES['image']['type'] == "image/jpg"||$_FILES['image']['type'] == "image/jpeg"){
- $im = imagecreatefromjpeg($_FILES['image']['tmp_name']);
- }elseif($_FILES['image']['type'] == "image/x-png"){
- $im = imagecreatefrompng($_FILES['image']['tmp_name']);
- }elseif($_FILES['image']['type'] == "image/gif"){
- $im = imagecreatefromgif($_FILES['image']['tmp_name']);
- }
- if($im){
- if(file_exists($pic_name.'.jpg')){
- unlink($pic_name.'.jpg');
- }
- ResizeImage($im,$pic_width,$pic_height,$pic_name);
- ImageDestroy ($im);
- }
- }
- ?>
-
- <img src="<? echo $pic_name.'.jpg'; ?>"><br><br>
- <form enctype="multipart/form-data" method="post" action="small_picture.php">
- <br>
- <input type="file" name="image" size="50" value="浏览"><p>
- 生成缩略图宽度:<input type="text" name="width" size="5"><p>
- 生成缩略图长度:<input type="text" name="length" size="5"><p>
- <input type="submit" value="上传图片">
- </form>
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