Add plugin file

utf8mb4-cli-upgrader.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Plugin Name:       utf8mb4 database upgrader CLI
+ * Plugin URI:        https://github.com/boogah/utf8mb4-cli-upgrader
+ * Description:       Upgrade your WordPress database to utf8mb4 via WP-CLI.
+ * Version:           1.0.0
+ * Requires at least: 4.2
+ * Requires PHP:      5.6
+ * Author:            Jason Cosper
+ * Author URI:        https://jasoncosper.com/
+ * License:           GPL-2.0+
+ * License URI:       https://www.gnu.org/licenses/gpl-2.0.txt
+ * GitHub Plugin URI: boogah/utf8mb4-cli-upgrader
+ */
+
+// If this file is called directly, abort.
+ if (! defined('WPINC')) {
+     die;
+ }
+
+ if (defined('WP_CLI') && WP_CLI) {
+     class utf8mb4_Database_Upgrade
+     {
+         /**
+          * Run utf8mb4 database conversion.
+          */
+         public function __invoke()
+         {
+             require_once(ABSPATH.'/wp-admin/includes/upgrade.php');
+             global $wpdb;
+             $mytables=$wpdb->get_results("SHOW TABLES");
+             foreach ($mytables as $mytable) {
+                 foreach ($mytable as $t) {
+                     $old_collation = $wpdb->get_var("SELECT TABLE_COLLATION FROM information_schema.TABLES WHERE TABLE_NAME = '$t'");
+                     WP_CLI::line("Table {$t} current collation: {$old_collation}");
+
+                     $converted = maybe_convert_table_to_utf8mb4($t);
+                     if ($converted) {
+                         $new_collation = $wpdb->get_var("SELECT TABLE_COLLATION FROM information_schema.TABLES WHERE TABLE_NAME = '$t'");
+                         WP_CLI::line("Table {$t} converted. New collation: {$new_collation}");
+                     }
+                 }
+             }
+         }
+     }
+
+     // Ensure WP_CLI class exists before adding the command.
+     if (class_exists('WP_CLI')) {
+         // Register our new CLI command.
+         WP_CLI::add_command('upgrade_utf8mb4', 'utf8mb4_Database_Upgrade');
+     }
+ }