What is meaning of “<<”, “--” in perl and implementation in php?

Question

I am converting some Perl code to PHP.
However, I do not know much about Perl, so I have to code it with a rough meaning.

And, I do not understand what the below P

Answer 1

Nothing very different from PHP actually.

• << Heredoc, also present in PHP with slight differences:

  echo (<<<"POST_DATA"
  First line
  Second line
  POST_DATA
  );
  

• -- Variable decrease, as in

Note:

Of course, inside a Heredoc -- is just text.

---

Suggestion:

If you don't fully understand the Perl, try to run it (it's not evil code).

my $boundary = 'Nobody-has-the-intention-to-erect-a-wall';
print(<<"POST_DATA");

--$boundary
Content-Disposition: form-data; name="num_result"
Content-Type: text/plain

$num_result
--$boundary
Content-Disposition: form-data; name="img"; filename="search.jpg"
Content-Type: image/jpeg

$image
--$boundary--
POST_DATA

Will yield:

 
--Nobody-has-the-intention-to-erect-a-wall
Content-Disposition: form-data; name="num_result"
Content-Type: text/plain


--Nobody-has-the-intention-to-erect-a-wall
Content-Disposition: form-data; name="img"; filename="search.jpg"
Content-Type: image/jpeg


--Nobody-has-the-intention-to-erect-a-wall--