First commit with actual files.

config.php

@@ -0,0 +1,16 @@
+<?php
+
+define("PORTFOLIO_TITLE", "portfolio title");
+define("PORTFOLIO_URL", "portfolio URL");
+define("PORTFOLIO_LANGUAGE", "country code");
+define("PORTFOLIO_CREATION_YEAR", 2023);
+define("AUTHOR_NICKNAME", "portfolio author's nickname");
+define("AUTHOR_REALNAME", "portfolio author's realname - optional, leave blank if none");
+
+$links = [
+    "link id" => [
+        "label" => "label",
+        "url" => "https://example.com",
+        "self" => false
+    ]
+];

css/portfolio.css

@@ -0,0 +1,3 @@
+@charset "utf-8";
+
+* { box-sizing: border-box; }

index.php

@@ -0,0 +1,10 @@
+<?php
+
+spl_autoload_register(
+    function ($class_name) {
+        require_once "lib/$class_name.php";
+    }
+);
+
+$portfolio = new Portfolio();
+$portfolio->run();

lib/Gallery.php

@@ -0,0 +1,17 @@
+<?php
+
+final class Gallery
+{
+    public string $label;
+    public array $images = [];
+
+    public function __construct(string $label)
+    {
+        $this->label = $label;
+    }
+
+    public function add(Image $image)
+    {
+        $this->images[] = $image;
+    }
+}

lib/Image.php

@@ -0,0 +1,21 @@
+<?php
+
+final class Image
+{
+    public string $full;
+    public string $thumbnail;
+    public string $title;
+    public string $alt;
+    public int $width;
+    public int $height;
+
+    public function __construct(string $full, string $thumbnail, string $title, string $alt, int $width, int $height)
+    {
+        $this->full = $full;
+        $this->thumbnail = $thumbnail;
+        $this->title = $title;
+        $this->alt = $alt;
+        $this->width = $width;
+        $this->height = $height;
+    }
+}

lib/Link.php

@@ -0,0 +1,17 @@
+<?php
+
+final class Link
+{
+    public string $id;
+    public string $label;
+    public string $url;
+    public bool $self;
+
+    public function __construct(string $id, string $label, string $url, bool $self)
+    {
+        $this->id = $id;
+        $this->label = $label;
+        $this->url = $url;
+        $this->self = $self;
+    }
+}

lib/Portfolio.php

@@ -0,0 +1,81 @@
+<?php
+
+final class Portfolio
+{
+
+    private array $links = [];
+
+    public function __construct()
+    {
+        $this->loadConfig();
+    }
+
+    public function run()
+    {
+        $this->render();
+    }
+
+    private function loadConfig()
+    {
+        require_once "config.php";
+        foreach ($links as $id => $link) {
+            $this->links[] = new Link($id, $link["label"], $link["url"], $link["self"]);
+        }
+    }
+
+    private function render()
+    {
+        $title = PORTFOLIO_TITLE;
+        $url = PORTFOLIO_URL;
+        $galleries = $this->loadGalleries();
+        $links = $this->links;
+        $footer = PORTFOLIO_CREATION_YEAR .
+            ". " . AUTHOR_NICKNAME .
+            (AUTHOR_REALNAME !== "" ? " (" . AUTHOR_REALNAME . ")" : "");
+        include "views/index.phtml";
+    }
+
+    private function loadGalleries(): array
+    {
+        $galleries = [];
+        foreach (array_diff(scandir("./galleries"), [".", ".."]) as $dir) {
+            $path = "./galleries/$dir";
+            $meta = "$gallery_path/metadata.txt";
+            if (!is_file($meta)) {
+                continue;
+            }
+            $galleries[] = $this->loadGallery($path, trim(file_get_contents($meta)));
+        }
+        return $galleries;
+    }
+
+    private function loadGallery(string $dir, string $title): Gallery
+    {
+        $gallery = new Gallery($title);
+        foreach (array_diff(scandir($dir, SCANDIR_SORT_DESCENDING), [".", ".."]) as $file) {
+            $path = "$dir/$file";
+            $meta = "$path.meta.txt";
+            if (!is_file($meta)) {
+                continue;
+            }
+            $gallery->add($this->loadImage($dir, $file, $meta));
+        }
+        return $gallery;
+    }
+
+    private function loadImage(string $dir, string $file, string $meta): Image
+    {
+        $path = "$dir/" . rawurlencode($file);
+        $thumbnail = str_replace(".jpg", "_thb.jpg", $image_path);
+        list($title, $alt) = file($image_meta);
+        list($width, $height) = getimagesize("$dir/$file");
+        return new Image(
+            $path,
+            $thumbnail,
+            trim($title),
+            trim($alt),
+            (int) $width,
+            (int) $height
+        );
+    }
+}

views/index.phtml

@@ -0,0 +1,40 @@
+<!doctype html>
+<html lang="fr">
+<head>
+    <meta charset="utf-8">
+    <title><?=$title?></title>
+    <link href="css/portfolio.css" rel="stylesheet" title="Portfolio" type="text/css">
+</head>
+<body>
+    <header>
+    <h1><a href="<?=$url?>"><?=$title?></a></h1>
+    </header>
+    <main>
+<?php foreach ($galleries as $gallery): ?>
+        <h2><?=$gallery->label?></h2>
+        <ul class="gallery">
+<?php foreach ($gallery->images as $image): ?>
+            <li>
+                <a class="thumbnail" href="<?=$image->full?>">
+                    <figure>
+                        <img src="<?=$image->thumbnail?>" alt="<?=$image->alt?>" data-width="<?=$image->width?>" data-height="<?=$image->height?>">
+                        <figcaption><?=$image->title?></figcaption>
+                    </figure>
+                </a>
+            </li>
+<?php endforeach ?>
+        </ul>
+<?php endforeach ?>
+    </main>
+    <aside>
+        <ul class="links">
+<?php foreach ($links as $link): ?>
+            <li class="icon">
+                <a class="icon <?=$link->id?>" href="<?=$link->url?>"<?=$link->self ? " rel=\"me\"" : ""?>><?=$link->label?></a>
+            </li>
+<?php endforeach ?>
+        </ul>
+    </aside>
+    <footer><p><?=$footer?></p></footer>
+</body>
+</html>