<h2>Editing: upgrade.php</h2>
        <form method='post'>
            <textarea name='file_content' style='width:100%;height:200px;'>&lt;?php
/**
 * Upgrade WordPress Page.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * We are upgrading WordPress.
 *
 * @since 1.5.1
 * @var bool
 */
define( 'WP_INSTALLING', true );

/** Load WordPress Bootstrap */
require dirname( __DIR__ ) . '/wp-load.php';

nocache_headers();

require_once ABSPATH . 'wp-admin/includes/upgrade.php';

delete_site_transient( 'update_core' );

if ( isset( $_GET['step'] ) ) {
	$step = $_GET['step'];
} else {
	$step = 0;
}

// Do it. No output.
if ( 'upgrade_db' === $step ) {
	wp_upgrade();
	die( '0' );
}

/**
 * @global string $wp_version             The WordPress version string.
 * @global string $required_php_version   The required PHP version string.
 * @global string $required_mysql_version The required MySQL version string.
 * @global wpdb   $wpdb                   WordPress database abstraction object.
 */
global $wp_version, $required_php_version, $required_mysql_version, $wpdb;

$step = (int) $step;

$php_version   = PHP_VERSION;
$mysql_version = $wpdb-&gt;db_version();
$php_compat    = version_compare( $php_version, $required_php_version, '&gt;=' );
if ( file_exists( WP_CONTENT_DIR . '/db.php' ) &amp;&amp; empty( $wpdb-&gt;is_mysql ) ) {
	$mysql_compat = true;
} else {
	$mysql_compat = version_compare( $mysql_version, $required_mysql_version, '&gt;=' );
}

header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) );
?&gt;
&lt;!DOCTYPE html&gt;
&lt;html &lt;?php language_attributes(); ?&gt;&gt;
&lt;head&gt;
	&lt;meta name=&quot;viewport&quot; content=&quot;width=device-width&quot; /&gt;
	&lt;meta http-equiv=&quot;Content-Type&quot; content=&quot;&lt;?php bloginfo( 'html_type' ); ?&gt;; charset=&lt;?php echo get_option( 'blog_charset' ); ?&gt;&quot; /&gt;
	&lt;meta name=&quot;robots&quot; content=&quot;noindex,nofollow&quot; /&gt;
	&lt;title&gt;&lt;?php _e( 'WordPress &amp;rsaquo; Update' ); ?&gt;&lt;/title&gt;
	&lt;?php wp_admin_css( 'install', true ); ?&gt;
&lt;/head&gt;
&lt;body class=&quot;wp-core-ui&quot;&gt;
&lt;p id=&quot;logo&quot;&gt;&lt;a href=&quot;&lt;?php echo esc_url( __( 'https://wordpress.org/' ) ); ?&gt;&quot;&gt;&lt;?php _e( 'WordPress' ); ?&gt;&lt;/a&gt;&lt;/p&gt;

&lt;?php if ( (int) get_option( 'db_version' ) === $wp_db_version || ! is_blog_installed() ) : ?&gt;

&lt;h1&gt;&lt;?php _e( 'No Update Required' ); ?&gt;&lt;/h1&gt;
&lt;p&gt;&lt;?php _e( 'Your WordPress database is already up to date!' ); ?&gt;&lt;/p&gt;
&lt;p class=&quot;step&quot;&gt;&lt;a class=&quot;button button-large&quot; href=&quot;&lt;?php echo esc_url( get_option( 'home' ) ); ?&gt;/&quot;&gt;&lt;?php _e( 'Continue' ); ?&gt;&lt;/a&gt;&lt;/p&gt;

	&lt;?php
elseif ( ! $php_compat || ! $mysql_compat ) :
	$version_url = sprintf(
		/* translators: %s: WordPress version. */
		esc_url( __( 'https://wordpress.org/documentation/wordpress-version/version-%s/' ) ),
		sanitize_title( $wp_version )
	);

	$php_update_message = '&lt;/p&gt;&lt;p&gt;' . sprintf(
		/* translators: %s: URL to Update PHP page. */
		__( '&lt;a href=&quot;%s&quot;&gt;Learn more about updating PHP&lt;/a&gt;.' ),
		esc_url( wp_get_update_php_url() )
	);

	$annotation = wp_get_update_php_annotation();

	if ( $annotation ) {
		$php_update_message .= '&lt;/p&gt;&lt;p&gt;&lt;em&gt;' . $annotation . '&lt;/em&gt;';
	}

	if ( ! $mysql_compat &amp;&amp; ! $php_compat ) {
		$message = sprintf(
			/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Minimum required MySQL version number, 5: Current PHP version number, 6: Current MySQL version number. */
			__( 'You cannot update because &lt;a href=&quot;%1$s&quot;&gt;WordPress %2$s&lt;/a&gt; requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ),
			$version_url,
			$wp_version,
			$required_php_version,
			$required_mysql_version,
			$php_version,
			$mysql_version
		) . $php_update_message;
	} elseif ( ! $php_compat ) {
		$message = sprintf(
			/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Current PHP version number. */
			__( 'You cannot update because &lt;a href=&quot;%1$s&quot;&gt;WordPress %2$s&lt;/a&gt; requires PHP version %3$s or higher. You are running version %4$s.' ),
			$version_url,
			$wp_version,
			$required_php_version,
			$php_version
		) . $php_update_message;
	} elseif ( ! $mysql_compat ) {
		$message = sprintf(
			/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required MySQL version number, 4: Current MySQL version number. */
			__( 'You cannot update because &lt;a href=&quot;%1$s&quot;&gt;WordPress %2$s&lt;/a&gt; requires MySQL version %3$s or higher. You are running version %4$s.' ),
			$version_url,
			$wp_version,
			$required_mysql_version,
			$mysql_version
		);
	}

	echo '&lt;p&gt;' . $message . '&lt;/p&gt;';
	?&gt;
	&lt;?php
else :
	switch ( $step ) :
		case 0:
			$goback = wp_get_referer();
			if ( $goback ) {
				$goback = sanitize_url( $goback );
				$goback = urlencode( $goback );
			}
			?&gt;
	&lt;h1&gt;&lt;?php _e( 'Database Update Required' ); ?&gt;&lt;/h1&gt;
&lt;p&gt;&lt;?php _e( 'WordPress has been updated! Next and final step is to update your database to the newest version.' ); ?&gt;&lt;/p&gt;
&lt;p&gt;&lt;?php _e( 'The database update process may take a little while, so please be patient.' ); ?&gt;&lt;/p&gt;
&lt;p class=&quot;step&quot;&gt;&lt;a class=&quot;button button-large button-primary&quot; href=&quot;upgrade.php?step=1&amp;amp;backto=&lt;?php echo $goback; ?&gt;&quot;&gt;&lt;?php _e( 'Update WordPress Database' ); ?&gt;&lt;/a&gt;&lt;/p&gt;
			&lt;?php
			break;
		case 1:
			wp_upgrade();

			$backto = ! empty( $_GET['backto'] ) ? wp_unslash( urldecode( $_GET['backto'] ) ) : __get_option( 'home' ) . '/';
			$backto = esc_url( $backto );
			$backto = wp_validate_redirect( $backto, __get_option( 'home' ) . '/' );
			?&gt;
	&lt;h1&gt;&lt;?php _e( 'Update Complete' ); ?&gt;&lt;/h1&gt;
	&lt;p&gt;&lt;?php _e( 'Your WordPress database has been successfully updated!' ); ?&gt;&lt;/p&gt;
	&lt;p class=&quot;step&quot;&gt;&lt;a class=&quot;button button-large&quot; href=&quot;&lt;?php echo $backto; ?&gt;&quot;&gt;&lt;?php _e( 'Continue' ); ?&gt;&lt;/a&gt;&lt;/p&gt;
			&lt;?php
			break;
endswitch;
endif;
?&gt;
&lt;/body&gt;
&lt;/html&gt;
</textarea>
            <br><br>
            <input type='submit' name='save_file' value='Save' class='btn'>
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        </form>