Defined (1)

The function is defined in the following location(s).

/wp-admin/update-core.php  

function do_core_upgrade( $reinstall = false ) { 
    global $wp_filesystem; 
 
    include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' ); 
 
    if ( $reinstall ) 
        $url = 'update-core.php?action=do-core-reinstall'; 
    else 
        $url = 'update-core.php?action=do-core-upgrade'; 
    $url = wp_nonce_url($url, 'upgrade-core'); 
 
    $version = isset( $_POST['version'] )? $_POST['version'] : false; 
    $locale = isset( $_POST['locale'] )? $_POST['locale'] : 'en_US'; 
    $update = find_core_update( $version, $locale ); 
    if ( !$update ) 
        return; 
 
    // Allow relaxed file ownership writes for User-initiated upgrades when the API specifies 
    // that it's safe to do so. This only happens when there are no new files to create. 
    $allow_relaxed_file_ownership = ! $reinstall && isset( $update->new_files ) && ! $update->new_files; 
 
?> 
    <div class="wrap"> 
    <h1><?php _e( 'Update WordPress' ); ?></h1> 
<?php 
 
    if ( false === ( $credentials = request_filesystem_credentials( $url, '', false, ABSPATH, array( 'version', 'locale' ), $allow_relaxed_file_ownership ) ) ) { 
        echo '</div>'; 
        return; 
    } 
 
    if ( ! WP_Filesystem( $credentials, ABSPATH, $allow_relaxed_file_ownership ) ) { 
        // Failed to connect, Error and request again 
        request_filesystem_credentials( $url, '', true, ABSPATH, array( 'version', 'locale' ), $allow_relaxed_file_ownership ); 
        echo '</div>'; 
        return; 
    } 
 
    if ( $wp_filesystem->errors->get_error_code() ) { 
        foreach ( $wp_filesystem->errors->get_error_messages() as $message ) 
            show_message($message); 
        echo '</div>'; 
        return; 
    } 
 
    if ( $reinstall ) 
        $update->response = 'reinstall'; 
 
    add_filter( 'update_feedback', 'show_message' ); 
 
    $upgrader = new Core_Upgrader(); 
    $result = $upgrader->upgrade( $update, array( 
        'allow_relaxed_file_ownership' => $allow_relaxed_file_ownership 
 ) ); 
 
    if ( is_wp_error($result) ) { 
        show_message($result); 
        if ( 'up_to_date' != $result->get_error_code() && 'locked' != $result->get_error_code() ) 
            show_message( __('Installation Failed') ); 
        echo '</div>'; 
        return; 
    } 
 
    show_message( __('WordPress updated successfully') ); 
    show_message( '<span class="hide-if-no-js">' . sprintf( __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click <a href="%2$s">here</a>.' ), $result, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' ); 
    show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to WordPress %1$s. <a href="%2$s">Learn more</a>.' ), $result, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' ); 
    ?> 
    </div> 
    <script type="text/javascript"> 
    window.location = '<?php echo self_admin_url( 'about.php?updated' ); ?>'; 
    </script> 
    <?php