Fix: Do not pass null to function that expects DateTime or string (#869)

PHP 8.0 is now EOL (#840)

PHP 7.4 EOL

Combine EOL date and period columns

Closes GH-499.

Update links to previously removed guides

We use Zend's PHP Legacy docs.

Closes GH-704.

Enhancement: Enable `array_syntax` fixer

Co-authored-by: MathiasReker <mathias@reker.dk>

Closes GH-659.

Enhancement: Enable `indentation_type` fixer

Closes GH-622.

Remove superfluous note

Closes GH-558.

Ternary to null coalescing

Use null coalescing operator ?? where possible.

Closes GH-528.

Add migration guide for EOL PHP 7.3

docs(eol): Migration guide 7.2

Added migration guide 7.2 to 7.3

Closes GH-377.

Added 7.1 migration guide link

Swap uses of _SERVER[DOCUMENT_ROOT] for __DIR__

1/n - Update / and /include/ only.

Add missing migration guide links

Remove the "eol" hackery that I added a couple of years ago.

For "modern" PHP branches (5.3 onwards), we'll base whether they're considered
active purely off the support dates for the br

Remove the "eol" hackery that I added a couple of years ago.

For "modern" PHP branches (5.3 onwards), we'll base whether they're considered
active purely off the support dates for the branch. To ensure that we don't
immediately remove the download links for EOL branches from the front page,
we'll still consider them "active" for those purposes for 28 days after the
final release.

Basically, rather than having two sources of truth for whether a branch is EOL
or not (the flag and the support dates in branches.inc), we now have one (the
support dates). This should be an improvement.

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Revert "Add an override for 5.4 on the EOL page for now."

This reverts commit 751d067b86f82ada97ff0645166b4c057bb932a6.

Add an override for 5.4 on the EOL page for now.

We can revert this once 5.4 has been moved to $OLDRELEASES, which will take
place once Stas confirms that there won't be an additional re

Add an override for 5.4 on the EOL page for now.

We can revert this once 5.4 has been moved to $OLDRELEASES, which will take
place once Stas confirms that there won't be an additional release, since the
door was left open in the 5.4.45 announcement.

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Link the supported versions page from some appropriate places.

Tidy up the EOL page and move interval formatting to an include file.

Remove the eol.php special case for 5.3.29.

Instead, let's have an optional "eol" flag for releases in the $RELEASES array,
and use that to drive eol.php.

Ensure we always link to the right downloads page.

Force 5.3.29 to be considered EOL.

Add new migration guides to the EOL page.

Kill off XHTML

Long live HTML5! =)

Fix EOL dates DateTime constructor bug. $detail['date'] is a Unix timestamp
and not a formated date. My mistake.