Windows 10: define variables as numeric

Hi, I've been trying to solve this for far too long. Trying to define variables as numeric. My
database fields are numeric(0.00, 10.00 etc.). I can't say "$prevbal=0.00;" or "$prevbal=10.00;" etc.
as all the tutorials describe. I remember seeing reference to something like "(int)sc;" but relocate it.
My statement
"$due = $prevbal + $latechg + $secdep + $damage + $courtcost + $nsf;" produces "Warning: A non-numeric
value encountered in C: on line 108". I could use help.
My code:
<?php...

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System environment variable won't stick

Running Win10 Home on an Acer Spin 3, 64bit, i7cpu. I try to add a path to the system environment variables by:

1. Control Panel > System > Advanced system settings > Advanced tab > Environment variables

2. The "Environment Variables" window opens.
3. In the "System Variables" pane I select "Path" and click the EDIT button.
4. A list of the current system paths is displayed.
5. I click the NEW button, browse to the path I want to add which is "C:\Python36-32" and click OK. The path "C:\Python36-32" is added to the list of current system paths.
6. I click OK and am returned to the "Environment Variables" window.
7. I click the "X" at the top right to close the "Environment Variables" window.

Now if I click the "Environment Variables" button again (end of step-1) and repeat steps 2-4, the new path I added in step-5 is gone. IOW, adding a new path won't stick.

What am I doing wrong?

 

Path Entries with BAT or REG

If you wanted to start thinking about using Powershell, here's a starter for 10:
Tutorial Powershell - Edit the PATH environment variable [ Step by step ]

It looks as though you could simply define $INCLUDE as you wish.


Then there's pathed which appears to support including semicolon separated lists.
pathed

 

Searching environment variable in list

I'm using a command that gives me a list of environment variables. When searching in the list, I want to find all environment variables with the word
EXTERNAL; using the following command all that is occurring is all the environment variables are being listed instead of those environment variables with the word
EXTERNAL ?

findstr /c "EXTERNAL"