Commit new slackware.uk content (with themes).

html/includes/breadcrumbs.php

@@ -0,0 +1,44 @@
+<?php
+  # 20200707 bkw: this breadcrumbs() function is loosely based on one
+  # from stackoverflow, but it's been simplified some.
+  function breadcrumbs($sep = ' &raquo; ', $home = 'Home') {
+    $pages = explode("/", $_SERVER['REQUEST_URI']);
+
+    # get rid of leading empty element, which will always be
+    # present since we split (exploded) on "/" and the URI
+    # always starts with a /. shift removes & returns the
+    # first (leftmost) element.
+    array_shift($pages);
+
+    # last dir shouldn't be a link, handled separately below.
+    # pop removes & returns the last (rightmost) element.
+    $last = array_pop($pages);
+    if($last == "") {
+      # if we got an empty $last, it means the URL ended
+      # with a /, so get the last non-empty path element
+      $last = array_pop($pages);
+    }
+
+    # links are server-relative, e.g. "/foo/bar" without the
+    # protocol or domain name. Build them in $url.
+    $url = "";
+
+    # home link is always visible and always a link. Doesn't
+    # matter on slackware.uk because the home page doesn't
+    # include breadcrumbs (no use for them there anyway).
+    $result = Array("<a href=\"/\">" . $home . "</a> ");
+
+    # PHP syntax note: $foo[] = "bar" is the same as Perl's
+    # push @foo, "bar".
+    foreach($pages as $dir) {
+      $url = $url . "/" . $dir;
+      $result[] = "<a href=\"" . $url . "\">" . $dir . "</a> ";
+    }
+
+    # add last (current) dir, but not as a link.
+    $result[] = $last;
+
+    # perl: return join($sep, @result);
+    return implode($sep, $result);
+  }
+?>