-<div id="footer">
-<?php do_action( 'in_admin_footer' ); ?>
-<p id="footer-left" class="alignleft"><?php
-$upgrade = apply_filters( 'update_footer', '' );
-$footer_text = array(
- '<span id="footer-thankyou">' . __( 'Thank you for creating with <a href="http://wordpress.org/">WordPress</a>.' ) . '</span>',
-);
-echo apply_filters( 'admin_footer_text', implode( ' • ', $footer_text ) );
-unset( $footer_text );
-?></p>
-<p id="footer-upgrade" class="alignright"><?php echo $upgrade; ?></p>
-<div class="clear"></div>
+<div id="wpfooter" role="contentinfo">
+ <?php
+ /**
+ * Fires after the opening tag for the admin footer.
+ *
+ * @since 2.5.0
+ */
+ do_action( 'in_admin_footer' );
+ ?>
+ <p id="footer-left" class="alignleft">
+ <?php
+ $text = sprintf( __( 'Thank you for creating with <a href="%s">WordPress</a>.' ), __( 'https://wordpress.org/' ) );
+ /**
+ * Filter the "Thank you" text displayed in the admin footer.
+ *
+ * @since 2.8.0
+ *
+ * @param string $text The content that will be printed.
+ */
+ echo apply_filters( 'admin_footer_text', '<span id="footer-thankyou">' . $text . '</span>' );
+ ?>
+ </p>
+ <p id="footer-upgrade" class="alignright">
+ <?php
+ /**
+ * Filter the version/update text displayed in the admin footer.
+ *
+ * WordPress prints the current version and update information,
+ * using core_update_footer() at priority 10.
+ *
+ * @since 2.3.0
+ *
+ * @see core_update_footer()
+ *
+ * @param string $content The content that will be printed.
+ */
+ echo apply_filters( 'update_footer', '' );
+ ?>
+ </p>
+ <div class="clear"></div>