PHP - 不可知的回声<<<构造[重复]

Question

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• Reference — What does this symbol mean in PHP? 18 answers

I have this construct found in a PHP script: echo <<<Start; in the script.

What does that mean?

My assumption is that's a kind of redirection, but it's only an assumption and I want to know the real function of this construct.

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Answer 1

It is called heredoc syntax:

echo <<<END
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;