php实现从上传文件创建缩略图的方法
发布:smiling 来源: PHP粉丝网 添加日期:2021-05-20 16:53:34 浏览: 评论:0
这篇文章主要介绍了php实现从上传文件创建缩略图的方法,涉及php操作上传文件及图片操作的技巧,具有一定参考借鉴价值,需要的朋友可以参考下。
本文实例讲述了php实现从上传文件创建缩略图的方法,分享给大家供大家参考,具体实现方法如下:
- <?php
- if ($_REQUEST['action']=="add"){
- $userfile = $HTTP_POST_FILES['photo']['tmp_name'];
- $userfile_name = $HTTP_POST_FILES['photo']['name'];
- $userfile_size = $HTTP_POST_FILES['photo']['size'];
- $userfile_type = $HTTP_POST_FILES['photo']['type'];
- /////////////////////////
- //GET-DECLARE DIMENSIONS //
- $dimension = getimagesize($userfile);
- $large_width = $dimension[0]; // GET PHOTO WIDTH
- $large_height = $dimension[1]; //GET PHOTO HEIGHT
- $small_width = 120; // DECLARE THUMB WIDTH
- $small_height = 90; // DECLARE THUMB HEIGHT
- /////////////////////////
- //CHECK SIZE //
- if ($userfile_size>102400){
- $error=1;
- $msg = "The photo is over 100kb. Please try again.";
- }
- ////////////////////////////////
- // CHECK TYPE (IE AND OTHERS) //
- if ($userfile_type="image/pjpeg"){
- if ($userfile_type!="image/jpeg"){
- $error=1;
- $msg = "The photo must be JPG";
- }
- }
- //////////////////////////////
- //CHECK WIDTH/HEIGHT //
- if ($large_width!=600 or$large_height!=400){
- $error=1;
- $msg = "The photo must be 600x400 pixels";
- }
- ///////////////////////////////////////////
- //CREATE THUMB / UPLOAD THUMB AND PHOTO ///
- if ($error<>1){
- $image = $userfile_name; //if you want to insert it to the database
- $pic = imagecreatefromjpeg($userfile);
- $small = imagecreatetruecolor($small_width,$small_height);
- imagecopyresampled($small,$pic,0,0,0,0, $small_width, $small_height, $large_width, $large_height);
- if (imagejpeg($small,"path/to/folder/to/upload/thumb".$userfile_name, 100)){
- $large = imagecreatetruecolor($large_width,$large_height);
- imagecopyresampled($large,$pic,0,0,0,0, $large_width, $large_height, $large_width, $large_height);
- if (imagejpeg($large,"path/to/folder/to/upload/photo".$userfile_name, 100))
- {}
- else {$msg="A problem has occured. Please try again."; $error=1;}
- }
- else {
- $msg="A problem has occured. Please try again."; $error=1;
- }
- }
- //////////////////////////////////////////////
- /// If everything went right a photo (600x400) and
- /// a thumb(120x90) were uploaded to the given folders
- }
- ?>
- <html><head><title>create thumb</title></head>
- <body>
- <form name="form1" enctype="multipart/form-data" action="thisfile.php?action=add" method="post">
- Select Photo: <input type="file" name="photo">
- <input type="submit" name="submit" value="CREATE THUMB AND UPLOAD">
- </form>
- </body
- </html>
Tags: php上传文件 php创建缩略图
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