[Solved] PHP Why does this work? [duplicate]

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<?=?> is a Short Tag for echo();
According to PHP

Outputs all parameters.

echo is not actually a function (it is a language construct), so you
are not required to use parentheses with it. echo (unlike some other
language constructs) does not behave like a function, so it cannot
always be used in the context of a function. Additionally, if you want
to pass more than one parameter to echo, the parameters must not be
enclosed within parentheses.

echo also has a shortcut syntax, where you can immediately follow the
opening tag with an equals sign. Prior to PHP 5.4.0, this short syntax
only works with the short_open_tag configuration setting enabled.

Gives you the also the next example:

I have <?=$foo?> foo.

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solved PHP Why does this work? [duplicate]