Expression and statement are nearly synonymous. A statement is basically an expression that stands on its own.
For example, 1+1 is a statement; however, in $x=1+1, the addition is an expression. The entire line is a statement(unless it's part of something bigger, like if($x=1+1) {}.
At least that's the way I think of them. Other people's thoughts may differ from mine.
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--Brent Dax
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