如何上传PNG，向其添加透明像素并将其写入数据库？

Question

I am looking for information on how to retrieve a PNG file sent to the server via POST. 我正在寻找有关如何检索通过POST发送到服务器的PNG文件的信息。 Subsequently, I want to increase the height of the image to make it equal to the width by adding equal areas of transparent pixels to the top and bottom. 随后，我想通过在顶部和底部添加相等的透明像素区域来增加图像的高度，使其等于宽度。 Finally, I want to write this PNG to my database. 最后，我想将此PNG写入数据库。

Does anybody have any resources that could help? 有人有什么资源可以帮助您吗？

Answer 1

The below code will give you the way to upload the png image and check if it's a png one. 以下代码将为您提供上传png图像并检查其是否为png图像的方法。 Now to change the height and width of the image you should use the GD library or ImageMagick. 现在，要更改图像的高度和宽度，您应该使用GD库或ImageMagick。

Check here: PHP crop image to fix width and height without losing dimension ratio 在这里检查： PHP裁剪图像以固定宽度和高度而不会丢失尺寸比例

In order to INSERT into in the DB as a BLOB check here: 为了以BLOB形式插入DB中，请在此处进行检查：

Write image file to database as BLOB (PHP) 将图像文件作为BLOB（PHP）写入数据库

<?php // upload.php

echo <<<_END
<html><head><title>PHP Form Upload</title></head><body>
<form method='post' action='upload.php' enctype='multipart/form-data'> 
Select File: <input type='file' name='filename' size='10' />
<input type='submit' value='Upload' />
</form>
_END;

if ($_FILES)
{
   $name = $_FILES['filename']['name']; 
   $type = $_FILES['filename']['type']; 
   $size = $_FILES['filename']['size']; 
   if ($type == "image/png") {
   move_uploaded_file($_FILES['filename']['tmp_name'], $name); 

   /* once the image has been uploaded change the height and width using the 
   correct library and insert into the DB as a BLOB */

}else{
   die("You must upload a png file");
}
echo "</body></html>"; ?>

如何上传PNG，向其添加透明像素并将其写入数据库？

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如何上传PNG，向其添加透明像素并将其写入数据库？

问题描述

1 个解决方案

解决方案1 1 已采纳

解决方案1
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