<h3>Düzenle: upgrade.php</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>&lt;?php
/**
 * Multisite upgrade administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

/** Load WordPress Administration Bootstrap */
require_once __DIR__ . &#039;/admin.php&#039;;

require_once ABSPATH . WPINC . &#039;/http.php&#039;;

/**
 * @global int $wp_db_version WordPress database version.
 */
global $wp_db_version;

// Used in the HTML title tag.
$title       = __( &#039;Upgrade Network&#039; );
$parent_file = &#039;upgrade.php&#039;;

get_current_screen()-&gt;add_help_tab(
	array(
		&#039;id&#039;      =&gt; &#039;overview&#039;,
		&#039;title&#039;   =&gt; __( &#039;Overview&#039; ),
		&#039;content&#039; =&gt;
			&#039;&lt;p&gt;&#039; . __( &#039;Only use this screen once you have updated to a new version of WordPress through Updates/Available Updates (via the Network Administration navigation menu or the Toolbar). Clicking the Upgrade Network button will step through each site in the network, five at a time, and make sure any database updates are applied.&#039; ) . &#039;&lt;/p&gt;&#039; .
			&#039;&lt;p&gt;&#039; . __( &#039;If a version update to core has not happened, clicking this button will not affect anything.&#039; ) . &#039;&lt;/p&gt;&#039; .
			&#039;&lt;p&gt;&#039; . __( &#039;If this process fails for any reason, users logging in to their sites will force the same update.&#039; ) . &#039;&lt;/p&gt;&#039;,
	)
);

get_current_screen()-&gt;set_help_sidebar(
	&#039;&lt;p&gt;&lt;strong&gt;&#039; . __( &#039;For more information:&#039; ) . &#039;&lt;/strong&gt;&lt;/p&gt;&#039; .
	&#039;&lt;p&gt;&#039; . __( &#039;&lt;a href=&quot;https://developer.wordpress.org/advanced-administration/multisite/admin/#network-admin-updates-screen&quot;&gt;Documentation on Upgrade Network&lt;/a&gt;&#039; ) . &#039;&lt;/p&gt;&#039; .
	&#039;&lt;p&gt;&#039; . __( &#039;&lt;a href=&quot;https://wordpress.org/support/forums/&quot;&gt;Support forums&lt;/a&gt;&#039; ) . &#039;&lt;/p&gt;&#039;
);

require_once ABSPATH . &#039;wp-admin/admin-header.php&#039;;

if ( ! current_user_can( &#039;upgrade_network&#039; ) ) {
	wp_die( __( &#039;Sorry, you are not allowed to access this page.&#039; ), 403 );
}

echo &#039;&lt;div class=&quot;wrap&quot;&gt;&#039;;
echo &#039;&lt;h1&gt;&#039; . __( &#039;Upgrade Network&#039; ) . &#039;&lt;/h1&gt;&#039;;

$action = isset( $_GET[&#039;action&#039;] ) ? $_GET[&#039;action&#039;] : &#039;show&#039;;

switch ( $action ) {
	case &#039;upgrade&#039;:
		$n = ( isset( $_GET[&#039;n&#039;] ) ) ? (int) $_GET[&#039;n&#039;] : 0;

		if ( $n &lt; 5 ) {
			update_site_option( &#039;wpmu_upgrade_site&#039;, $wp_db_version );
		}

		$site_ids = get_sites(
			array(
				&#039;spam&#039;                   =&gt; 0,
				&#039;deleted&#039;                =&gt; 0,
				&#039;archived&#039;               =&gt; 0,
				&#039;network_id&#039;             =&gt; get_current_network_id(),
				&#039;number&#039;                 =&gt; 5,
				&#039;offset&#039;                 =&gt; $n,
				&#039;fields&#039;                 =&gt; &#039;ids&#039;,
				&#039;order&#039;                  =&gt; &#039;DESC&#039;,
				&#039;orderby&#039;                =&gt; &#039;id&#039;,
				&#039;update_site_meta_cache&#039; =&gt; false,
			)
		);
		if ( empty( $site_ids ) ) {
			echo &#039;&lt;p&gt;&#039; . __( &#039;All done!&#039; ) . &#039;&lt;/p&gt;&#039;;
			break;
		}
		echo &#039;&lt;ul&gt;&#039;;
		foreach ( (array) $site_ids as $site_id ) {
			switch_to_blog( $site_id );
			$siteurl     = site_url();
			$upgrade_url = admin_url( &#039;upgrade.php?step=upgrade_db&#039; );
			restore_current_blog();

			echo &quot;&lt;li&gt;$siteurl&lt;/li&gt;&quot;;

			$response = wp_remote_get(
				$upgrade_url,
				array(
					&#039;timeout&#039;     =&gt; 120,
					&#039;httpversion&#039; =&gt; &#039;1.1&#039;,
					&#039;sslverify&#039;   =&gt; false,
				)
			);

			if ( is_wp_error( $response ) ) {
				wp_die(
					sprintf(
						/* translators: 1: Site URL, 2: Server error message. */
						__( &#039;Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: %2$s&#039; ),
						$siteurl,
						&#039;&lt;em&gt;&#039; . $response-&gt;get_error_message() . &#039;&lt;/em&gt;&#039;
					)
				);
			}

			/**
			 * Fires after the Multisite DB upgrade for each site is complete.
			 *
			 * @since MU (3.0.0)
			 *
			 * @param array $response The upgrade response array.
			 */
			do_action( &#039;after_mu_upgrade&#039;, $response );

			/**
			 * Fires after each site has been upgraded.
			 *
			 * @since MU (3.0.0)
			 *
			 * @param int $site_id The Site ID.
			 */
			do_action( &#039;wpmu_upgrade_site&#039;, $site_id );
		}
		echo &#039;&lt;/ul&gt;&#039;;
		?&gt;&lt;p&gt;&lt;?php _e( &#039;If your browser does not start loading the next page automatically, click this link:&#039; ); ?&gt; &lt;a class=&quot;button&quot; href=&quot;upgrade.php?action=upgrade&amp;amp;n=&lt;?php echo ( $n + 5 ); ?&gt;&quot;&gt;&lt;?php _e( &#039;Next Sites&#039; ); ?&gt;&lt;/a&gt;&lt;/p&gt;
		&lt;script type=&quot;text/javascript&quot;&gt;
		&lt;!--
		function nextpage() {
			location.href = &quot;upgrade.php?action=upgrade&amp;n=&lt;?php echo ( $n + 5 ); ?&gt;&quot;;
		}
		setTimeout( &quot;nextpage()&quot;, 250 );
		//--&gt;
		&lt;/script&gt;
		&lt;?php
		break;
	case &#039;show&#039;:
	default:
		if ( (int) get_site_option( &#039;wpmu_upgrade_site&#039; ) !== $wp_db_version ) :
			?&gt;
		&lt;h2&gt;&lt;?php _e( &#039;Database Update Required&#039; ); ?&gt;&lt;/h2&gt;
		&lt;p&gt;&lt;?php _e( &#039;WordPress has been updated! Next and final step is to individually upgrade the sites in your network.&#039; ); ?&gt;&lt;/p&gt;
		&lt;?php endif; ?&gt;

		&lt;p&gt;&lt;?php _e( &#039;The database update process may take a little while, so please be patient.&#039; ); ?&gt;&lt;/p&gt;
		&lt;p&gt;&lt;a class=&quot;button button-primary&quot; href=&quot;upgrade.php?action=upgrade&quot;&gt;&lt;?php _e( &#039;Upgrade Network&#039; ); ?&gt;&lt;/a&gt;&lt;/p&gt;
		&lt;?php
		/**
		 * Fires before the footer on the network upgrade screen.
		 *
		 * @since MU (3.0.0)
		 */
		do_action( &#039;wpmu_upgrade_page&#039; );
		break;
}
?&gt;
&lt;/div&gt;

&lt;?php require_once ABSPATH . &#039;wp-admin/admin-footer.php&#039;; ?&gt;
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