Description:
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From manual page: http://www.php.net/function.current
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The "effective prototype" of function `current` has actually been changed from

    mixed current ( array &$array )

to

    mixed current ( array $array )

by this commit: https://github.com/php/php-src/commit/745504ea2a7066588af9714f5e32523a3fff4db7

and similarly for function `key`.

That is: Starting with PHP version 7.0.0, current() and key() no longer take their parameter by reference (but always by value).
Moreover, prior to this version, they *preferred* to take it by reference if possible, but still accepted it by value otherwise.

This can be compared to e.g. function `reset`, which always takes its parameter by reference.

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Here's a live example that current() and key() do not take the parameter by reference in PHP 7 (and also in PHP 4.4.1, maybe an old bug?), contrary to reset():

https://3v4l.org/BNkR8
https://3v4l.org/Eb8bc
https://3v4l.org/7jpXG

And here's a live example that they have long (always?) accepted an argument passed by value (except in PHP 5.0.5, maybe an old bug?), contrary to reset():

https://3v4l.org/COcBl
https://3v4l.org/BPuff
https://3v4l.org/6UVun

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N.B.: I had started to edit the docs at https://edit.php.net/?project=PHP&perm=en/function.current.php (and also file en/reference/array/functions/key.xml) as anonymous #84338, first just the prototypes (removed the role="reference"), but when I wanted to add a refsect1 role="changelog" then my browser crashed, and after logging in back, now those two files seem locked with a "Work in progress" I cannot cancel...