Fixed PHP 8.0 warning.

README.md

@@ -2,15 +2,15 @@
 
 This is the development repository for Browsing History, a WordPress plugin that saves user's browsing history and lists them. You can also download the plugin package installation from the [WordPress.org Plugin Directory](https://wordpress.org/plugins/browsing-history/).
 
-Contributors: takashimatsuyama
-Donate link:
-Tags: browsing history, accessibility, design
-Requires at least: 4.8
-Tested up to: 5.7
-Requires PHP: 5.4.0
-Stable tag: 1.2.1
-License: GPLv2 or later
-License URI: http://www.gnu.org/licenses/gpl-2.0.html
+Contributors: takashimatsuyama  
+Donate link:  
+Tags: browsing history, accessibility, design  
+Requires at least: 4.8  
+Tested up to: 5.7  
+Requires PHP: 5.4.0  
+Stable tag: 1.2.2  
+License: GPLv2 or later  
+License URI: http://www.gnu.org/licenses/gpl-2.0.html  
 
 Save user’s browsing history and list them.
 
@@ -36,6 +36,9 @@ Detailed usage is under preparation.
 
 ##  Changelog
 
+# 1.2.2
+Fixed PHP 8.0 warning.
+
 # 1.2.1
 Modify the handle names of wp_enqueue_script.
 

addons/ccc-post_thumbnail/ccc-post_thumbnail.php

@@ -16,7 +16,7 @@ public static function get_first_image_url( $post=null ) {
         ob_start();
         ob_end_clean();
         preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post_content, $matches);
-        if( $matches[1][0] ) {
+        if( isset($matches[1][0]) ) {
           $first_img = $matches[1][0]; //投稿本文の中から1枚目の画像のURLを取得
         }
       } // endif

browsing-history.php

@@ -3,7 +3,7 @@
  * Plugin Name: Browsing History
  * Plugin URI: https://wordpress.org/plugins/browsing-history
  * Description: Save user’s browsing history and list them.
- * Version: 1.2.1
+ * Version: 1.2.2
  * Requires at least: 4.8
  * Requires PHP: 5.4.0
  * Author: Takashi Matsuyama

function.php

@@ -31,6 +31,8 @@ public function save_scripts() {
     if( ! ( is_home() or is_front_page() ) and ( is_single() or is_page() ) ) {
       global $post;
       $post_id = $post->ID;
+    } else {
+      $post_id = null;
     }
     $handle = 'ccc_browsing_history-save';
     $file = 'save.js';

readme.txt

@@ -5,7 +5,7 @@ Tags: browsing history, accessibility, design
 Requires at least: 4.8
 Tested up to: 5.7
 Requires PHP: 5.4.0
-Stable tag: 1.2.1
+Stable tag: 1.2.2
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -31,18 +31,10 @@ Detailed usage is under preparation.
 2. Activate the plugin through the 'Plugins' menu in WordPress.
 3. Use shortcodes to display the browsing history list.
 
-== Screenshots ==
+== Discover More ==
 
-== Changelog ==
-
-= 1.2.1 =
-Modify the handle names of wp_enqueue_script.
+This plugin is [developed on GitHub](https://github.com/takashi-matsuyama/browsing-history)
 
-= 1.2.0 =
-Modify markup of thumbnails and modify CSS.
-
-= 1.1.0 =
-Add shortcode attribute (`style=""`) and modify CSS.
+== Changelog ==
 
-= 1.0.0 =
-Initial release.
+See the [release notes on GitHub](https://github.com/takashi-matsuyama/browsing-history/releases).