Migrate the class and update code for PHP 8.0+.

src/FeatureImageColumn.php

@@ -0,0 +1,223 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheFrosty;
+
+/**
+ * Class FeatureImageColumn
+ * @package src
+ */
+class FeatureImageColumn
+{
+
+    protected const ID = 'featured-image';
+
+    /**
+     * Ensures that the rest of the code only runs on edit.php pages
+     *
+     * @since 0.3
+     */
+    public function addHooks(): void
+    {
+        add_action('admin_menu', call_user_func([$this, 'adminMenu']));
+        add_action('admin_init', call_user_func([$this, 'adminInit']));
+        add_action('admin_enqueue_scripts', call_user_func([$this, 'style']));
+    }
+
+    /**
+     * Activation hook, to add our default settings.
+     */
+    public function activationHook(): void
+    {
+        $post_types = [];
+        foreach ($this->getPostTypes() as $post_type) {
+            if (!post_type_supports($post_type, 'thumbnail')) {
+                continue;
+            }
+            $post_types[$post_type] = $post_type;
+        }
+        update_option('featured_image_column', $post_types);
+    }
+
+    /**
+     * Register our settings page.
+     */
+    protected function adminMenu(): void
+    {
+        add_options_page(
+            'Featured Image Column Settings',
+            'Featured Image Col',
+            'manage_options',
+            'featured-image-column',
+            function (): void {
+                $this->settingsPage();
+            }
+        );
+    }
+
+    /**
+     * Since the load-edit.php hook is too early for checking the post type, hook the rest
+     * of the code to the wp action to allow the query to be run first.
+     */
+    protected function adminInit(): void
+    {
+        global $pagenow;
+
+        $this->registerSettings();
+
+        // Only continue if we're on the 'edit.php' page(s)
+        if (empty($pagenow) || $pagenow !== 'edit.php' && defined('DOING_AJAX') && !DOING_AJAX) {
+            return;
+        }
+
+        // Make sure we've got some post_types saved via our settings.
+        $post_types = $this->getSettings();
+        if (empty($post_types)) {
+            return;
+        }
+
+        // Add out custom column and column data
+        foreach ($post_types as $post_type) {
+            if (!post_type_supports($post_type, 'thumbnail')) {
+                continue;
+            }
+            add_filter("manage_{$post_type}_posts_columns", \call_user_func([$this, 'columns']));
+            add_action("manage_{$post_type}_posts_custom_column", \call_user_func([$this, 'columnData']), 10, 2);
+        }
+    }
+
+    /**
+     * Output our settings.
+     * @since 0.2.2
+     */
+    protected function settingsPage(): void
+    {
+        $post_types = $this->getSettings();
+        if (empty($post_types)) {
+            $post_types = [];
+            foreach ($this->getPostTypes() as $key => $post_type) {
+                if (post_type_supports($post_type, 'thumbnail')) {
+                    $post_types[$post_type] = $post_type;
+                }
+            }
+            update_option('featured_image_column', $post_types);
+        }
+
+        include dirname(__FILE__, 2) . '/views/settings.php';
+    }
+
+    /**
+     * Enqueue our stylesheet on the edit.php page.
+     * @param string $hook
+     */
+    protected function style($hook): void
+    {
+        wp_register_style(
+            'featured-image-column',
+            plugin_dir_url(__FILE__) . 'css/column.css',
+            [],
+            '20170625'
+        );
+
+        if ($hook === 'edit.php') {
+            wp_enqueue_style('featured-image-column');
+        }
+    }
+
+    /**
+     * Filter the image in before the 'title'
+     * @param array $columns
+     * @return array
+     */
+    protected function columns(array $columns): array
+    {
+        $new_columns = [];
+        foreach ($columns as $key => $title) {
+            // Put the Thumbnail column before the Title column
+            if ($key === 'title') {
+                $new_columns[self::ID] = esc_html__('Image', 'featured-image-column');
+            }
+
+            $new_columns[$key] = $title;
+        }
+
+        return $new_columns;
+    }
+
+    /**
+     * Output the image
+     *
+     * @param string $column_name
+     * @param int $post_id
+     */
+    protected function columnData(string $column_name, int $post_id):  void
+    {
+        if (self::ID !== $column_name) {
+            return;
+        }
+
+        $featured_image = $this->getTheImage($post_id);
+
+        if (!empty($featured_image)) {
+            echo $featured_image;
+
+            return;
+        }
+
+        echo "&nbsp;"; // This helps prevent issues with empty cells
+    }
+
+    /**
+     * Register the plugins settings.
+     */
+    protected function registerSettings(): void
+    {
+        register_setting(
+            'featured_image_column_post_types',
+            'featured_image_column',
+            static function (mixed $input): array {
+                if (!is_array($input)) {
+                    $input = (array)$input;
+                }
+
+                return array_map('sanitize_key', $input);
+            }
+        );
+    }
+
+    /**
+     * Function to get the image.
+     * @param int|null $post_id
+     * @return string
+     */
+    protected function getTheImage(?int $post_id): string
+    {
+        if (has_post_thumbnail($post_id)) {
+            return get_the_post_thumbnail($post_id);
+        }
+
+        $default = plugins_url('images/default.png', __FILE__);
+        $image = apply_filters('featured_image_column_default_image', $default);
+
+        return sprintf('<img alt="%1$s" src="%2$s">', esc_attr(get_the_title($post_id)), esc_url($image));
+    }
+
+    /**
+     * Get our settings from the DB with the defaults set to an array.
+     * @return array
+     */
+    protected function getSettings(): array
+    {
+        return get_option('featured_image_column', []);
+    }
+
+    /**
+     * Helper function to return all public post ty`pes
+     * @return array
+     */
+    protected function getPostTypes(): array
+    {
+        return get_post_types(['public' => true]);
+    }
+}