How to echo a $_POST with a blank space

There is a database I imported from Access and converted it to MySQL. There are column names with spaces. I created a function that you give it the column names and automatically created a form. Well, when trying to echo a $_POST with a space, for example, $_POST[“EMP ID”] it does not echo.

I created a test page to try and analyze this problem in a simple way:

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" enctype="multipart/form-data" name="testform" >
<input type="text" name="test ing" />
<input type="hidden" name="process" value="1" />
<input type="submit" value="click!" />
	echo $_POST['test ing'];

So, how can I echo a $_POST with a space?