PHP uses the Firefox poster tool to simulate post submission issues

PHP uses Firefox poster tool to simulate post submission issues
I use Firefox's poster tool to simulate post submissions. Submitted to c.php
The content of c.php is
Print_r ($_post);
?>

Use Firefox's poster tool to fill in the URL with the following content http://a.com/c.php

Content-type: Set the text/html
The submitted parameter Seckey is 123, Val is 123
I press post to submit and return the contents to array ()

I changed c.php to the following, print $_get
Print_r ($_get);
?>

I press get to commit and return the contents to array (' seckey ' = ' 123 ', ' val ' = ' 123 ')

May I ask what the problem is. Why Post commits past content, print array is empty
------Solution--------------------
The first step

Step Two

Step Three

