From which version is PHP's <<< delimiter supported? Will it be abandoned in the future?

Question

Which version of PHP’s <<< delimiter is supported starting from? Will it be abandoned in the future?

$a = <<<TEST
<form action="" method="get">
    <input name="t" type="text">
    <input name="s" type="submit">
</form>
TEST;

Answer 1

The 7+ version has not been abandoned yet, but no one can say what will happen in the future.

Nowdoc structure was added in PHP 5.3.0.

nowdoc