[Displaying googles search results n yor won page]

I don't think that uses google. I think he's a friend of the owners of those sites and they let the searcher access the database. Am I wrong?

[Strange Text Output : "<!-- -->" instead of my text when print or echo]

Does any of the stuff have things similar to closing a tag, double quotes, or single quotes?

I believe I had the same problem when I was creating a php similarily (messageboard for work) and it was because I wasn't properly escaping the text.

addslashes(string)
htmlentities(string)
htmlspecialchars(string)
striptags(string) * I think

[using mysql replace() to replace quotes??]

Can you elaborate more? If your question is as simple as I think, then knowing that \ will force anything directly after it to be interpretted literally in a database will probably help you out (Except for predefined escape sequences).

INSERT INTO table VALUES('This is a \" test');
Inserts: This is a " test

Edit:

Looking at your post a little bit, I might understand your problem better.

UPDATE table SET column = replace(column, '\"', 'feet');
Does that sound plausible?

[Html Tag in Php Variable]

I don't know if you still need help, but the backslash \ is the escape character, not the forward slash.

"<\/TR>"