Hi, had the same problem and looked at a back up of my old misc.php file.
I don’t know much about php but the difference in the files in the last function at 900 was easy to spot.
using an FTP program (filezilla) I edited the misc.php and replaced the last function with the fuction below. Just make copy and paste. Ensure to leave the last two line after </script>.
I have no idea what effect this has on other things but it got me back to my dashboard. I looks like just the defintions of the array was missing.
function wp_admin_canonical_url() {
$removable_query_args = array(
‘message’, ‘settings-updated’, ‘saved’,
‘update’, ‘updated’, ‘activated’,
‘activate’, ‘deactivate’, ‘locked’,
‘deleted’, ‘trashed’, ‘untrashed’,
‘enabled’, ‘disabled’, ‘skipped’,
‘spammed’, ‘unspammed’,
);
/**
* Filter the list of URL parameters to remove.
*
* @since 4.2.0
*
* @param array $removable_query_args An array of parameters to remove from the URL.
*/
$removable_query_args = apply_filters( ‘removable_query_args’, $removable_query_args );
if ( empty( $removable_query_args ) ) {
return;
}
// Ensure we’re using an absolute URL.
$current_url = set_url_scheme( ‘https://’ . $_SERVER[‘HTTP_HOST’] . $_SERVER[‘REQUEST_URI’] );
$filtered_url = remove_query_arg( $removable_query_args, $current_url );
?>
<link id=”wp-admin-canonical” rel=”canonical” href=”<?php echo esc_url( $filtered_url ); ?>” />
<script>
if ( window.history.replaceState ) {
window.history.replaceState( null, null, document.getElementById( ‘wp-admin-canonical’ ).href + window.location.hash );
}
</script>
