setup a local web server
code some php
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Step 3 - The difference between 'echo' and 'print' has little to do with HTML. See http://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40
Step 4 - Check your spelling. More importantly, use a backslash to escape characters in a string (you show a forward slash). The example showing concatenation with the "." operator should not use quotes
Step 5 - The 'str' variable is missing its $ in the assignment. You have also put the operation in quotes, so the variable would contain the literal string "5+5", and not the result of the operation. Remove the quotes.