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<?php

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/**

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* Upgrade WordPress Page.

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* @package WordPress

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* @subpackage Administration

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/**

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* We are upgrading WordPress.

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* @since 1.5.1

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* @var bool

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define( 'WP_INSTALLING', true );

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/** Load WordPress Bootstrap */

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require dirname( __DIR__ ) . '/wp-load.php';

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nocache_headers();

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

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delete_site_transient( 'update_core' );

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if ( isset( $_GET['step'] ) ) {

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$step = $_GET['step'];

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} else {

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$step = 0;

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}

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// Do it. No output.

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if ( 'upgrade_db' === $step ) {

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wp_upgrade();

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die( '0' );

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}

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/**

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* @global string $wp_version The WordPress version string.

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* @global string $required_php_version The required PHP version string.

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* @global string $required_mysql_version The required MySQL version string.

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global $wp_version, $required_php_version, $required_mysql_version;

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$step = (int) $step;

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$php_version = phpversion();

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$mysql_version = $wpdb->db_version();

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$php_compat = version_compare( $php_version, $required_php_version, '>=' );

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if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) ) {

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$mysql_compat = true;

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} else {

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$mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );

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}

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header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) );

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<!DOCTYPE html>

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<head>

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<?php wp_admin_css( 'install', true ); ?>

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</head>

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<?php if ( (int) get_option( 'db_version' ) === $wp_db_version || ! is_blog_installed() ) : ?>

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<?php

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elseif ( ! $php_compat || ! $mysql_compat ) :

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$version_url = sprintf(

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/* translators: %s: WordPress version. */

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esc_url( __( 'https://wordpress.org/support/wordpress-version/version-%s/' ) ),

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sanitize_title( $wp_version )

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);

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/* translators: %s: URL to Update PHP page. */

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$php_update_message = '</p><p>' . sprintf(

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__( '<a href="%s">Learn more about updating PHP</a>.' ),

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esc_url( wp_get_update_php_url() )

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);

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$annotation = wp_get_update_php_annotation();

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if ( $annotation ) {

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$php_update_message .= '</p><p><em>' . $annotation . '</em>';

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}

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if ( ! $mysql_compat && ! $php_compat ) {

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$message = sprintf(

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/* 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. */

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__( 'You cannot update because <a href="%1$s">WordPress %2$s</a> 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.' ),

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$version_url,

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$wp_version,

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$required_php_version,

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$required_mysql_version,

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$php_version,

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$mysql_version

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) . $php_update_message;

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} elseif ( ! $php_compat ) {

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$message = sprintf(

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/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Current PHP version number. */

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__( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher. You are running version %4$s.' ),

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$version_url,

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$wp_version,

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$required_php_version,

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$php_version

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) . $php_update_message;

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} elseif ( ! $mysql_compat ) {

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$message = sprintf(

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/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required MySQL version number, 4: Current MySQL version number. */

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__( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires MySQL version %3$s or higher. You are running version %4$s.' ),

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$version_url,

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$wp_version,

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$required_mysql_version,

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$mysql_version

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);

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}

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echo '<p>' . $message . '</p>';

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<?php

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else :

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switch ( $step ) :

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case 0:

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$goback = wp_get_referer();

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if ( $goback ) {

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$goback = esc_url_raw( $goback );

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$goback = urlencode( $goback );

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}

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<?php

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break;

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case 1:

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wp_upgrade();

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$backto = ! empty( $_GET['backto'] ) ? wp_unslash( urldecode( $_GET['backto'] ) ) : __get_option( 'home' ) . '/';

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$backto = esc_url( $backto );

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$backto = wp_validate_redirect( $backto, __get_option( 'home' ) . '/' );

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<?php

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break;

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endswitch;

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endif;

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</body>

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</html>

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