upgrade_420

The timeline below displays how wordpress function upgrade_420 has changed across different WordPress versions. If a version is not listed, refer to the next available version below.

WordPress Version: 5.3

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @ignore
 * @since 4.2.0
 */
function upgrade_420()
{
}

WordPress Version: 4.5

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @ignore
 * @since 4.2.0
 *
 * @global int   $wp_current_db_version
 * @global wpdb  $wpdb
 */
function upgrade_420()
{
}

WordPress Version: 4.3

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @since 4.2.0
 *
 * @global int   $wp_current_db_version
 * @global wpdb  $wpdb
 */
function upgrade_420()
{
}

WordPress Version: .20

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @since 4.2.0
 */
function upgrade_420()
{
}

WordPress Version: 2.2

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @since 4.2.0
 */
function upgrade_420()
{
    global $wp_current_db_version, $wpdb;
    if ($wp_current_db_version < 31351 && $wpdb->charset === 'utf8mb4') {
        if (is_multisite()) {
            $tables = $wpdb->tables('blog');
        } else {
            $tables = $wpdb->tables('all');
        }
        foreach ($tables as $table) {
            maybe_convert_table_to_utf8mb4($table);
        }
    }
}

WordPress Version: .10

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @since 4.2.0
 */
function upgrade_420()
{
}

WordPress Version: 4.2

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @since 4.2.0
 */
function upgrade_420()
{
    global $wp_current_db_version, $wpdb;
    if ($wp_current_db_version < 31351 && $wpdb->charset === 'utf8mb4') {
        if (is_multisite()) {
            $tables = $wpdb->tables('blog');
        } else {
            $tables = $wpdb->tables('all');
        }
        foreach ($tables as $table) {
            maybe_convert_table_to_utf8mb4($table);
        }
    }
}