حل مشکل خطای XML سایت مپ 🔧 رفع ارور XML declaration allowed only at the start

<?php
function ___wejns_wp_whitespace_fix($input) {
    $allowed = false;
    $found = false;
    foreach (headers_list() as $header) {
        if (preg_match(
            "/^content-type:\\s+(text\\/|application\\/((xhtml|atom|rss)\\+xml|xml))/i",
            $header
        )) {
            $allowed = true;
        }
        if (preg_match("/^content-type:\\s+/i", $header)) {
            $found = true;
        }
    }
    if ($allowed || !$found) {
        return preg_replace("/\\A\\s*/m", "", $input);
    } else {
        return $input;
    }
}
ob_start("___wejns_wp_whitespace_fix");
?>

include('whitespacefix.php');

<?php
include('whitespacefix.php');
/**
 * Front to the WordPress application. This file doesn't do
 * anything, but loads wp-blog-header.php which does and
 * tells WordPress to load the theme.
 *
 * @package WordPress
 */

define( 'WP_USE_THEMES', true );

/** Loads the WordPress Environment and Template */
require __DIR__ . '/wp-blog-header.php';