newly created blog page giving php error

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I posted in the WordPress tech support forum asking how to create a
"sidebar" page that showed the last 3 posts from my blog, and someone
replied telling me to create a php page with a certain chunk of code in

However, when I created that PHP page and pasted the code in:
I get the error "Fatal error: Call to undefined function: _e() in
/var/www/html/test-last-10.php on line 2".  I asked why I was getting
that error, but it's been 3 days and I don't think they're answering
any more.

I haven't used PHP so I was wondering if there's something really
obvious that the person who was helping me, left out of the
instructions, so that if I change something, it will work?

I know generally how to program so I know what the error means, that
it's calling a function "_e()" which hasn't been defined.  What I'm
wondering is if someone who is PHP-savvy would be able to look at this
and see something that I'm not seeing, a simple change that would make
the whole thing just work.

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