php cannot receive data

php cannot receive data

The form form is a very commonly used html tag, which can submit data for us to the server, upload files, etc. Sometimes the background program cannot receive data. Let's take a look at the solution.

1. $_POST cannot receive data, but $_GET can receive data.

1. If the header information content-type is "content-type :application/x-www-form-urlencoded", this transmission is to submit data in the form of a form, and PHP uses the $_POST method to accept it.

2. If the header information content-type is "content-type:application/json", this transmission is to submit data in json mode, and PHP needs to use file_get_contents("php://input" )Accept the way to get the input stream.

2. When uploading files, $_POST data and $_FILES data cannot be received

Cause: The file size exceeds the post_max_size set by php.ini, resulting in POST data is empty, and the FILES data is also empty.

Solution:

1. The simplest is to set the file size post_max_size larger in php.ini and then restart the server.

2. Or use JS on the page to prompt the user, please upload a file of a specified size.

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