ウェブのルートディレクトリ（Apache では public_html）に次のファイルとディレクトリを置く。
- index.php
- .htaccess
- user などのディレクトリ
index.php
すべてのアクセスにおいてルートディレクトリの index.php を読みこむようにする。この設定は htaccess で行う。
index.php では
- SQLデータベースの接続
- 汎用的なユーザー定義関数の定義
- グローバル変数の設定
- ヘッダーとフッターの読みこみ
などを行う。サインインなどの複雑なページが多い場合、四番目のヘッダーとフッターの読みこみは行わないほうがいい。
.htaccess
すべてのページで上の index.php を読みこませるためには htaccess でリダイレクトを行う。
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php<span class="katex"><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1.138em;vertical-align:-0.25em;"></span><span class="mord">−</span><span class="mopen">[</span><span class="mord mathnormal">L</span><span class="mclose">]</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.07153em;">C</span><span class="mord mathnormal">o</span><span class="mord mathnormal">n</span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.07153em;">C</span><span class="mord mathnormal">o</span><span class="mord mathnormal">n</span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">e</span><span class="mord">./</span><span class="mord mathnormal">in</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord">.</span><span class="mord mathnormal">p</span><span class="mord mathnormal">h</span><span class="mord mathnormal">p</span><span class="mopen">[</span><span class="mord mathnormal">L</span><span class="mclose">]</span><span class="mord cjk_fallback">続いて相対パスをディレクトリにアクセスさせる。</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.05764em;">E</span><span class="mord mathnormal">n</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">in</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.02778em;">O</span><span class="mord mathnormal">n</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.05017em;">B</span><span class="mord mathnormal">a</span><span class="mord mathnormal">se</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.00773em;">R</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord"><span class="mord mathnormal">e</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.888em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mopen mtight">(</span></span></span></span></span></span></span></span><span class="mord mathnormal">a</span><span class="mord mathnormal">cco</span><span class="mord mathnormal">u</span><span class="mord mathnormal">n</span><span class="mord mathnormal">t</span><span class="mord">∣</span><span class="mord mathnormal">s</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">n</span><span class="mord">∣</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.02778em;">ser</span><span class="mclose">)</span><span class="mopen">(</span><span class="mord">.</span><span class="mord">∗</span><span class="mclose">)</span></span></span></span> index.php [L]
これで /account/ という相対パスにアクセスできるようになった。/account/ にアクセスしたときの表示は /account/index.php に書く。
