图片压缩之三（php实现）
[*]<?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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