Add a rough EOL page, per the Internals discussion. Copy editing welc…

…ome!

I haven't linked this from anywhere yet, pending further discussion.

eol.php

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+<?php
+$_SERVER['BASE_PAGE'] = 'eol.php';
+
+include_once $_SERVER['DOCUMENT_ROOT'] . '/include/prepend.inc';
+include_once $_SERVER['DOCUMENT_ROOT'] . '/include/branches.inc';
+
+// Notes for specific branches can be added here, and will appear in the table.
+$BRANCH_NOTES = array(
+	'4.4' => 'Has known remote code execution vulnerabilities.',
+);
+
+site_header('Unsupported Branches');
+?>
+
+<h1>Unsupported Branches</h1>
+
+<p>
+	This page lists the end of life date for each unsupported branch of PHP. If
+	you are using these releases, you are strongly urged to upgrade to
+	<a href="/downloads">a current version</a>, as using older versions may
+	expose you to security vulnerabilities and bugs that have been fixed in
+	more recent versions of PHP.
+</p>
+
+<table class="standard">
+	<thead>
+		<tr>
+			<th>Branch</th>
+			<th colspan="2">Date</th>
+			<th>Last Release</th>
+			<th>Notes</th>
+		</tr>
+	</thead>
+	<tbody>
+		<?php foreach (get_eol_branches() as $major => $branches): ?>
+			<?php foreach ($branches as $branch => $detail): ?>
+				<tr>
+					<td><?php echo htmlspecialchars($branch); ?></td>
+					<td>
+						<?php echo date('j M Y', $detail['date']); ?>
+					</td>
+					<td>
+						<?php echo number_format($ago = floor((time() - $detail['date']) / 86400)); ?>
+						day<?php echo ($ago != 1 ? 's' : ''); ?> ago
+					</td>
+					<td>
+						<a href="/releases/#<?php echo htmlspecialchars($detail['version']); ?>">
+							<?php echo htmlspecialchars($detail['version']); ?>
+						</a>
+					</td>
+					<td>
+						<?php echo isset($BRANCH_NOTES[$branch]) ? $BRANCH_NOTES[$branch] : ''; ?>
+					</td>
+				</tr>
+			<?php endforeach; ?>
+		<?php endforeach; ?>
+	</tbody>
+</table>
+
+<?php site_footer(); ?>

include/branches.inc

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+<?php
+include_once $_SERVER['DOCUMENT_ROOT'] . '/include/releases.inc';
+include_once $_SERVER['DOCUMENT_ROOT'] . '/include/version.inc';
+
+function version_number_to_branch($version) {
+	$parts = explode('.', $version);
+	if (count($parts) > 1) {
+		return "$parts[0].$parts[1]";
+	}
+}
+
+function get_eol_branches() {
+	$branches = array();
+
+	// Gather the last release on each branch into a convenient array.
+	foreach ($GLOBALS['OLDRELEASES'] as $major => $releases) {
+		foreach ($releases as $version => $release) {
+			if ($branch = version_number_to_branch($version)) {
+				if (!isset($branches[$major][$branch]) || version_compare($version, $branches[$major][$branch]['version'], 'gt')) {
+					$branches[$major][$branch] = array(
+						'date' => strtotime($release['date']),
+						'version' => $version,
+					);
+				}
+			}
+		}
+	}
+
+	/* Exclude releases from active branches, where active is defined as "in
+	 * the $RELEASES array". */
+	foreach ($GLOBALS['RELEASES'] as $major => $releases) {
+		foreach ($releases as $version => $release) {
+			if ($branch = version_number_to_branch($version)) {
+				if (isset($branches[$major][$branch])) {
+					unset($branches[$major][$branch]);
+				}
+			}
+		}
+	}
+
+	krsort($branches);
+	foreach ($branches as $major => $branch) {
+		krsort($branch);
+	}
+
+	return $branches;
+}