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String Interpolation & Heredoc
Prerequisites: Strings
For a longer, multi-line string, heredoc avoids escaping quotes while still interpolating variables:
$name = "Ada";
$message = <<<TEXT
Hello, $name!
Welcome to PHP.
TEXT;
echo $message;
Nowdoc (<<<'TEXT', with quotes around the identifier) behaves
like single quotes — no interpolation at all — useful for embedding
literal text with lots of $ signs.