Description:
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From manual page: http://www.php.net/function.echo
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Example #1 echo examples

Many of the examples (all except the first one, the 8th and 9th, and the last three) have nothing to do with echo itself but with how string literals work. Those examples would make perfect sense replacing 'echo' with '$somevar=' 

Putting those examples in the documentation for echo
a) bloats the documentation of one language construct with unrelated stuff
b) is misleading and ambiguous, potentially leading the reader to wrongly think that variable substitution in literal strings, or heredoc syntax, are somehow specific to echo, while they are not and can be used also without echo