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。具体实现方法如下：
<?phpif ($_request['action']=="add"){$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>
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以上就是php操作上传文件及图片操作的方法的详细内容。