diff --git a/include/header.php b/include/header.php
index 329af18..02baf40 100644
--- a/include/header.php
+++ b/include/header.php
@@ -3,7 +3,7 @@
   <head>
     <meta content="text/html; charset=utf-8" http-equiv="content-type" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <title><?php echo SITE_NAME.'：'.$title; ?></title>
+    <title><?= SITE_NAME.'：'.$title; ?></title>
     <link rel="stylesheet" type="text/css" href="/static/style.css" />
   </head>
   <body>
diff --git a/include/menu.php b/include/menu.php
index b0ff1a6..0c5b871 100644
--- a/include/menu.php
+++ b/include/menu.php
@@ -1,4 +1,4 @@
-      <div class="links-<?php echo $linktype; ?>">
+      <div class="links-<?= $linktype; ?>">
         <p>
 <?php if ($linktype == 'top') { ?>
           <a href="/">トップ</a> |
diff --git a/www/about.php b/www/about.php
index 612fbbc..3c4f602 100644
--- a/www/about.php
+++ b/www/about.php
@@ -10,7 +10,7 @@
 ?>
 
       <hr />
-      <h1><?php echo SITE_NAME.' '.VERSION; ?></h1>
+      <h1><?= SITE_NAME.' '.VERSION; ?></h1>
 
       <p>
         匿名自営業０７６のテクニカル諏訪子様の商品です。<br />
@@ -21,7 +21,7 @@
       </p>
 
       <hr />
-      <h1><?php echo SITE_NAME_EN.' '.VERSION; ?></h1>
+      <h1><?= SITE_NAME_EN.' '.VERSION; ?></h1>
 
       <p>
         This is a product of TechnicalSuwako from 076 Anonymous Independent Business.<br />
diff --git a/www/search.php b/www/search.php
index 1f6e6bc..4c186ee 100644
--- a/www/search.php
+++ b/www/search.php
@@ -77,7 +77,7 @@
       <hr />
       <div class="form">
         <form action="/search.php" method="get">
-          <input type="text" name="q" value="<?php echo $q; ?>" />
+          <input type="text" name="q" value="<?= $q; ?>" />
           <input type="submit" value="送信" />
         </form>
       </div>
@@ -85,17 +85,17 @@
 
 <?php foreach ($res as $r) { ?>
       <div class="result">
-        <a href="<?php echo $r['url']; ?>">
-          <span class="result-url"><?php echo $r['url']; ?></span>
-          <div class="result-title"><?php echo $r['title']; ?></div>
-          <div class="result-description"><?php echo $r['body']; ?></div>
+        <a href="<?= $r['url']; ?>">
+          <span class="result-url"><?= $r['url']; ?></span>
+          <div class="result-title"><?= $r['title']; ?></div>
+          <div class="result-description"><?= $r['body']; ?></div>
         </a>
       </div>
 <?php } ?>
 
       <hr />
 <?php for ($i = 1; $i <= ceil($totalpages/$limit); $i++) { ?>
-      <a class="pagination" href="/search.php?q=<?php echo $q; ?>&page=<?php echo $i; ?>"><?php echo $i; ?></a>
+      <a class="pagination" href="/search.php?q=<?= $q; ?>&page=<?= $i; ?>"><?= $i; ?></a>
 <?php } ?>
 
 <?php
diff --git a/www/submit.php b/www/submit.php
index 3f9e1a9..d30520c 100644
--- a/www/submit.php
+++ b/www/submit.php
@@ -56,7 +56,7 @@
       <hr />
 <?php if ($_SERVER['REQUEST_METHOD'] === 'POST') { ?>
       <p>
-        <h1><?php echo $h; ?>の追加</h1>
+        <h1><?= $h; ?>の追加</h1>
 <?php   if (empty($err)) { ?>
         URLを追加しました。<br />
         24時間以内から索引作業開始しますので、お待ち下さいませ。<br /><br />
@@ -67,7 +67,7 @@
         下記のエラーが出ました (I got the following error)：<br />
         <ul>
 <?php     foreach ($err as $e) { ?>
-          <li><?php echo $e; ?></li>
+          <li><?= $e; ?></li>
 <?php     } ?>
         </ul>
 <?php   } ?>
@@ -90,7 +90,7 @@
       </ul>
       <hr />
       <form action="/submit.php" method="POST">
-        <input type="hidden" name="csrf" value="<?php echo $csrf; ?>" />
+        <input type="hidden" name="csrf" value="<?= $csrf; ?>" />
         URL：<input type="text" name="hostname" placeholder="例）https://suwakochan.moe" value="" />
         <input type="submit" value="送信" />
       </form>
