diff options
Diffstat (limited to 'vhosts/blog/public/posts/2022-11-19/phperkaigi-2023-unused-token-quiz-2/index.html')
| -rw-r--r-- | vhosts/blog/public/posts/2022-11-19/phperkaigi-2023-unused-token-quiz-2/index.html | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/vhosts/blog/public/posts/2022-11-19/phperkaigi-2023-unused-token-quiz-2/index.html b/vhosts/blog/public/posts/2022-11-19/phperkaigi-2023-unused-token-quiz-2/index.html index a870f0d4..5071e1ce 100644 --- a/vhosts/blog/public/posts/2022-11-19/phperkaigi-2023-unused-token-quiz-2/index.html +++ b/vhosts/blog/public/posts/2022-11-19/phperkaigi-2023-unused-token-quiz-2/index.html @@ -85,7 +85,7 @@ 注意: これはボツ問なので、得られたトークンを PHPerKaigi で入力してもポイントにはならない。 </p> - <pre class="highlight" language="php" linenumbering="unnumbered"><code class="highlight"><span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> + <pre class="highlight" language="php"><code class="highlight"><span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> @@ -107,7 +107,7 @@ 実行してみると、次のような出力が得られる。 </p> - <pre class="highlight" language="php" linenumbering="unnumbered"><code class="highlight"><span class="hljs-comment">#</span> + <pre class="highlight" language="php"><code class="highlight"><span class="hljs-comment">#</span> <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> @@ -122,7 +122,7 @@ 1 行目を除き、先ほどのコードとほぼ同じものが出てきた。もう一度実行してみる。 </p> - <pre class="highlight" language="php" linenumbering="unnumbered"><code class="highlight"><span class="hljs-comment">#</span> + <pre class="highlight" language="php"><code class="highlight"><span class="hljs-comment">#</span> W <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> <span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">""</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<?php printf((isset($s)?fn($s)=>trim($s,""):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span> @@ -137,7 +137,7 @@ W 今度は 2 行目が書き換えられた。すべての行が変化するまで繰り返すと次のようになる。 </p> - <pre class="highlight" language="php" linenumbering="unnumbered"><code class="highlight"><span class="hljs-comment">#</span> + <pre class="highlight" language="php"><code class="highlight"><span class="hljs-comment">#</span> W E L @@ -163,7 +163,7 @@ P</code></pre> Vim で開くと次のようになる (1 行目を抜粋)。 </p> - <pre class="highlight" language="php" linenumbering="unnumbered"><code class="highlight"><span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">"<200b>"</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<200b><?php printf((isset($s)?fn($s)=>trim($s,"<200b>"):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span></code></pre> + <pre class="highlight" language="php"><code class="highlight"><span class="hljs-meta"><?php</span> <span class="hljs-title function_ invoke__">printf</span>((<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$s</span>)?<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">trim</span>(<span class="hljs-variable">$s</span>,<span class="hljs-string">"<200b>"</span>):<span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>))(<span class="hljs-variable">$s</span>=<span class="hljs-string">'<200b><?php printf((isset($s)?fn($s)=>trim($s,"<200b>"):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span>).<span class="hljs-string">"\n"</span>,<span class="hljs-string">"\x27<span class="hljs-subst">$s</span>\x27"</span>);<span class="hljs-meta">?></span></code></pre> <p> <code><200b></code> と表示されているのは、Unicode の U+200b で、ゼロ幅スペースである。 @@ -188,13 +188,13 @@ P</code></pre> 続いて、トークンへの変換ロジックを解析する。注目すべきはこの部分だ。以下、ゼロ幅スペースは Vim での表示に合わせて <code><200b></code> と記載する。 </p> - <pre class="highlight" language="php" linenumbering="unnumbered"><code class="highlight"><span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>)</code></pre> + <pre class="highlight" language="php"><code class="highlight"><span class="hljs-function"><span class="hljs-keyword">fn</span>(<span class="hljs-params"><span class="hljs-variable">$s</span></span>)=></span><span class="hljs-title function_ invoke__">chr</span>(<span class="hljs-title function_ invoke__">strlen</span>(<span class="hljs-variable">$s</span>)/<span class="hljs-number">3</span>)</code></pre> <p> PHP の <code>strlen()</code> は文字列のバイト数を返す。1 行目の <code>$s</code> は以下の内容となっており、 </p> - <pre class="highlight" language="php" linenumbering="unnumbered"><code class="highlight"><span class="hljs-variable">$s</span>=<span class="hljs-string">'<200b><?php printf((isset($s)?fn($s)=>trim($s,"<200b>"):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span></code></pre> + <pre class="highlight" language="php"><code class="highlight"><span class="hljs-variable">$s</span>=<span class="hljs-string">'<200b><?php printf((isset($s)?fn($s)=>trim($s,"<200b>"):fn($s)=>chr(strlen($s)/3))($s=%s)."\n","\x27$s\x27");?>'</span></code></pre> <p> このソースコードは UTF-8 で書かれているので、105 バイトになる。それを 3 で割ると 35 となり、これは <code>#</code> の ASCII コードと一致する。他の行も、同様にしてゼロ幅スペースを詰めることで文字列長を調整し、トークンをエンコードしている。 |