Basic PHP

This is an example of an escape slash: "do you see the quotes"
"Double quotes" vs 'single quotes'
Double quotes are escaped using the "\" symbol prepended to the quotation mark such as \", and so are single quotes: \'
You may use double quotes (") inside single quotes without using an escape character

$var = "variable 1"
$var = "variable 1"

variable 1, variable 2
This is how you concatenate variables (after they are assigned): "$var1 . $var2"

$_SERVER['SCRIPT_FILENAME']
/home/john4887/public_html/440/assignment2/basic.php
$_SERVER['HTTP_USER_AGENT']
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

How to add and subtract
"5 + 3 = " 8
"4 - 1 = " 3

I AM A CONSTANT
CONSTANTS are IMMUTABLE (meaning once they're set, they cannot change)

Echoing "writeMsg()" = function called!

This is an if-else statement
yes, blue is blue

This is an if-elseif-else statement
yes, red is red

This is a switch/case clause
getting close!