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function update_db_to_utf8mb4() {
if (!isset($_GET['update-utf8bm4'])) {
require_once( ABSPATH . 'wp-admin/includes/upgrade.php');
/** WordPress Administration API */
require_once(ABSPATH . 'wp-admin/includes/admin.php');
/** WordPress Schema API */
require_once(ABSPATH . 'wp-admin/includes/schema.php');
$tables = $wpdb->tables('all');
if (!wp_should_upgrade_global_tables()) {
$global_tables = $wpdb->tables('global');
$tables = array_diff_assoc($tables, $global_tables);
foreach ($tables as $table) {
add_action('wp_loaded', 'update_db_to_utf8mb4');

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@eloone eloone commented Jun 20, 2017

Is it intended that in !isset($_GET['update-utf8bm4']) it is update-utf8bm4 and not update-utf8mb4?
Anyone using this script should pay attention to that.

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