PHP：post 全局变量的总长度是多少？
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PHP: whats the total length of a post global variable?
提问by phpNutt
I was wondering if anybody knows the total length that a post global could be. e.g:
我想知道是否有人知道 post global 的总长度。例如：
$_POST['formInput'] = "hello world, how long can i be?";
I am creating a site where someone will enter an unknown amount of chars into a textarea, so potentially it could be 2 pages on a word document. So if anybody knows of any other methods of how i can do this apart from using a post global? (it cant be saved in a file, as its important data that i dont want other people to find) That would be very helpful.
我正在创建一个网站，有人将在其中输入未知数量的字符到 textarea 中，因此它可能是 word 文档上的 2 页。因此，如果有人知道除了使用 post global 之外我还可以如何做到这一点的任何其他方法？（它不能保存在文件中，因为它的重要数据我不想让其他人找到）这将非常有帮助。
Thanks
谢谢
回答by Sampson
Check your php.ini for post_max_size. This is typically about 8mb by default, but if you're on shared-hosting, it could definitely vary.
检查您的 php.ini 中的post_max_size. 默认情况下，这通常约为 8mb，但如果您使用的是共享主机，则肯定会有所不同。
; Maximum size of POST data that PHP will accept. post_max_size = 8M
You'll have to use $_POSTif you wish to send large amounts of data to the server. For further study, I'd suggest checking out POST Method Uploadsin the documentation.
你将不得不使用$_POST，如果你想大量数据发送到服务器。为了进一步研究，我建议查看文档中的POST Method Uploads。
回答by troelskn
$_POSTis populated from the body of a HTTP-request. Since there are no restrictions on the size of a HTTP-request, there are no restrictions in the protocol layer. However PHP has some limitations on how much input it will read. You can control this with the ini-setting post_max_size
$_POST从 HTTP 请求的正文填充。由于对 HTTP 请求的大小没有限制，因此协议层没有限制。但是，PHP 对读取的输入量有一些限制。您可以使用 ini 设置来控制它post_max_size
回答by Petr Novotny
Another problem can be the default limit in php.ini for directive max_input_vars (default 1000), not only the post_max_size. If you have e.g. a very large form with thousands of checkboxes the $_POST array will have only 1000 keys.
另一个问题可能是 php.ini 中指令 max_input_vars（默认 1000）的默认限制，而不仅仅是 post_max_size。例如，如果您有一个包含数千个复选框的非常大的表单，则 $_POST 数组将只有 1000 个键。
回答by Pascal MARTIN
If you want some large amount of data sent from the browser to the server, you'll have to use HTTP POST method -- which means the data will be received, on the PHP side, in the $_POSTsuperglobal array ; there's not much you can do about that.
如果您想将大量数据从浏览器发送到服务器，则必须使用 HTTP POST 方法——这意味着数据将在 PHP 端的$_POST超全局数组中接收；对此你无能为力。
The configuration directive post_max_sizedefines the maximum amount of data that can be received using the POST method -- you might need to set that to a value higher than the default one, depending on your needs.
配置指令post_max_size定义了可以使用 POST 方法接收的最大数据量——您可能需要将其设置为高于默认值的值，具体取决于您的需要。
And, as said on the documentation of post_max_size, the value set for memory_limitcan also have its importance.
而且，正如在 的文档中所说post_max_size，为 设置的值memory_limit也很重要。
