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：
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;$msg = the photo must be 600x400 pixels;}/////////////////////////////////////////////create thumb / upload thumb and photo ///if ($error1){ $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}?>create thumbselect photo: 希望本文所述对大家的php程序设计有所帮助。