[Summary view] [Print] [Text view]

   1  <?php
   2  /**
   3   * WordPress core upgrade functionality.
   4   *
   5   * @package WordPress
   6   * @subpackage Administration
   7   * @since 2.7.0
   8   */
   9  
  10  /**
  11   * Stores files to be deleted.
  12   *
  13   * @since 2.7.0
  14   * @global array $_old_files
  15   * @var array
  16   * @name $_old_files
  17   */
  18  global $_old_files;
  19  
  20  $_old_files = array(
  21  // 2.0
  22  'wp-admin/import-b2.php',
  23  'wp-admin/import-blogger.php',
  24  'wp-admin/import-greymatter.php',
  25  'wp-admin/import-livejournal.php',
  26  'wp-admin/import-mt.php',
  27  'wp-admin/import-rss.php',
  28  'wp-admin/import-textpattern.php',
  29  'wp-admin/quicktags.js',
  30  'wp-images/fade-butt.png',
  31  'wp-images/get-firefox.png',
  32  'wp-images/header-shadow.png',
  33  'wp-images/smilies',
  34  'wp-images/wp-small.png',
  35  'wp-images/wpminilogo.png',
  36  'wp.php',
  37  // 2.0.8
  38  'wp-includes/js/tinymce/plugins/inlinepopups/readme.txt',
  39  // 2.1
  40  'wp-admin/edit-form-ajax-cat.php',
  41  'wp-admin/execute-pings.php',
  42  'wp-admin/inline-uploading.php',
  43  'wp-admin/link-categories.php',
  44  'wp-admin/list-manipulation.js',
  45  'wp-admin/list-manipulation.php',
  46  'wp-includes/comment-functions.php',
  47  'wp-includes/feed-functions.php',
  48  'wp-includes/functions-compat.php',
  49  'wp-includes/functions-formatting.php',
  50  'wp-includes/functions-post.php',
  51  'wp-includes/js/dbx-key.js',
  52  'wp-includes/js/tinymce/plugins/autosave/langs/cs.js',
  53  'wp-includes/js/tinymce/plugins/autosave/langs/sv.js',
  54  'wp-includes/links.php',
  55  'wp-includes/pluggable-functions.php',
  56  'wp-includes/template-functions-author.php',
  57  'wp-includes/template-functions-category.php',
  58  'wp-includes/template-functions-general.php',
  59  'wp-includes/template-functions-links.php',
  60  'wp-includes/template-functions-post.php',
  61  'wp-includes/wp-l10n.php',
  62  // 2.2
  63  'wp-admin/cat-js.php',
  64  'wp-admin/import/b2.php',
  65  'wp-includes/js/autosave-js.php',
  66  'wp-includes/js/list-manipulation-js.php',
  67  'wp-includes/js/wp-ajax-js.php',
  68  // 2.3
  69  'wp-admin/admin-db.php',
  70  'wp-admin/cat.js',
  71  'wp-admin/categories.js',
  72  'wp-admin/custom-fields.js',
  73  'wp-admin/dbx-admin-key.js',
  74  'wp-admin/edit-comments.js',
  75  'wp-admin/install-rtl.css',
  76  'wp-admin/install.css',
  77  'wp-admin/upgrade-schema.php',
  78  'wp-admin/upload-functions.php',
  79  'wp-admin/upload-rtl.css',
  80  'wp-admin/upload.css',
  81  'wp-admin/upload.js',
  82  'wp-admin/users.js',
  83  'wp-admin/widgets-rtl.css',
  84  'wp-admin/widgets.css',
  85  'wp-admin/xfn.js',
  86  'wp-includes/js/tinymce/license.html',
  87  // 2.5
  88  'wp-admin/css/upload.css',
  89  'wp-admin/images/box-bg-left.gif',
  90  'wp-admin/images/box-bg-right.gif',
  91  'wp-admin/images/box-bg.gif',
  92  'wp-admin/images/box-butt-left.gif',
  93  'wp-admin/images/box-butt-right.gif',
  94  'wp-admin/images/box-butt.gif',
  95  'wp-admin/images/box-head-left.gif',
  96  'wp-admin/images/box-head-right.gif',
  97  'wp-admin/images/box-head.gif',
  98  'wp-admin/images/heading-bg.gif',
  99  'wp-admin/images/login-bkg-bottom.gif',
 100  'wp-admin/images/login-bkg-tile.gif',
 101  'wp-admin/images/notice.gif',
 102  'wp-admin/images/toggle.gif',
 103  'wp-admin/includes/upload.php',
 104  'wp-admin/js/dbx-admin-key.js',
 105  'wp-admin/js/link-cat.js',
 106  'wp-admin/profile-update.php',
 107  'wp-admin/templates.php',
 108  'wp-includes/images/wlw/WpComments.png',
 109  'wp-includes/images/wlw/WpIcon.png',
 110  'wp-includes/images/wlw/WpWatermark.png',
 111  'wp-includes/js/dbx.js',
 112  'wp-includes/js/fat.js',
 113  'wp-includes/js/list-manipulation.js',
 114  'wp-includes/js/tinymce/langs/en.js',
 115  'wp-includes/js/tinymce/plugins/autosave/editor_plugin_src.js',
 116  'wp-includes/js/tinymce/plugins/autosave/langs',
 117  'wp-includes/js/tinymce/plugins/directionality/images',
 118  'wp-includes/js/tinymce/plugins/directionality/langs',
 119  'wp-includes/js/tinymce/plugins/inlinepopups/css',
 120  'wp-includes/js/tinymce/plugins/inlinepopups/images',
 121  'wp-includes/js/tinymce/plugins/inlinepopups/jscripts',
 122  'wp-includes/js/tinymce/plugins/paste/images',
 123  'wp-includes/js/tinymce/plugins/paste/jscripts',
 124  'wp-includes/js/tinymce/plugins/paste/langs',
 125  'wp-includes/js/tinymce/plugins/spellchecker/classes/HttpClient.class.php',
 126  'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyGoogleSpell.class.php',
 127  'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspell.class.php',
 128  'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspellShell.class.php',
 129  'wp-includes/js/tinymce/plugins/spellchecker/css/spellchecker.css',
 130  'wp-includes/js/tinymce/plugins/spellchecker/images',
 131  'wp-includes/js/tinymce/plugins/spellchecker/langs',
 132  'wp-includes/js/tinymce/plugins/spellchecker/tinyspell.php',
 133  'wp-includes/js/tinymce/plugins/wordpress/images',
 134  'wp-includes/js/tinymce/plugins/wordpress/langs',
 135  'wp-includes/js/tinymce/plugins/wordpress/wordpress.css',
 136  'wp-includes/js/tinymce/plugins/wphelp',
 137  'wp-includes/js/tinymce/themes/advanced/css',
 138  'wp-includes/js/tinymce/themes/advanced/images',
 139  'wp-includes/js/tinymce/themes/advanced/jscripts',
 140  'wp-includes/js/tinymce/themes/advanced/langs',
 141  // 2.5.1
 142  'wp-includes/js/tinymce/tiny_mce_gzip.php',
 143  // 2.6
 144  'wp-admin/bookmarklet.php',
 145  'wp-includes/js/jquery/jquery.dimensions.min.js',
 146  'wp-includes/js/tinymce/plugins/wordpress/popups.css',
 147  'wp-includes/js/wp-ajax.js',
 148  // 2.7
 149  'wp-admin/css/press-this-ie-rtl.css',
 150  'wp-admin/css/press-this-ie.css',
 151  'wp-admin/css/upload-rtl.css',
 152  'wp-admin/edit-form.php',
 153  'wp-admin/images/comment-pill.gif',
 154  'wp-admin/images/comment-stalk-classic.gif',
 155  'wp-admin/images/comment-stalk-fresh.gif',
 156  'wp-admin/images/comment-stalk-rtl.gif',
 157  'wp-admin/images/del.png',
 158  'wp-admin/images/gear.png',
 159  'wp-admin/images/media-button-gallery.gif',
 160  'wp-admin/images/media-buttons.gif',
 161  'wp-admin/images/postbox-bg.gif',
 162  'wp-admin/images/tab.png',
 163  'wp-admin/images/tail.gif',
 164  'wp-admin/js/forms.js',
 165  'wp-admin/js/upload.js',
 166  'wp-admin/link-import.php',
 167  'wp-includes/images/audio.png',
 168  'wp-includes/images/css.png',
 169  'wp-includes/images/default.png',
 170  'wp-includes/images/doc.png',
 171  'wp-includes/images/exe.png',
 172  'wp-includes/images/html.png',
 173  'wp-includes/images/js.png',
 174  'wp-includes/images/pdf.png',
 175  'wp-includes/images/swf.png',
 176  'wp-includes/images/tar.png',
 177  'wp-includes/images/text.png',
 178  'wp-includes/images/video.png',
 179  'wp-includes/images/zip.png',
 180  'wp-includes/js/tinymce/tiny_mce_config.php',
 181  'wp-includes/js/tinymce/tiny_mce_ext.js',
 182  // 2.8
 183  'wp-admin/js/users.js',
 184  'wp-includes/js/swfupload/plugins/swfupload.documentready.js',
 185  'wp-includes/js/swfupload/plugins/swfupload.graceful_degradation.js',
 186  'wp-includes/js/swfupload/swfupload_f9.swf',
 187  'wp-includes/js/tinymce/plugins/autosave',
 188  'wp-includes/js/tinymce/plugins/paste/css',
 189  'wp-includes/js/tinymce/utils/mclayer.js',
 190  'wp-includes/js/tinymce/wordpress.css',
 191  // 2.8.5
 192  'wp-admin/import/btt.php',
 193  'wp-admin/import/jkw.php',
 194  // 2.9
 195  'wp-admin/js/page.dev.js',
 196  'wp-admin/js/page.js',
 197  'wp-admin/js/set-post-thumbnail-handler.dev.js',
 198  'wp-admin/js/set-post-thumbnail-handler.js',
 199  'wp-admin/js/slug.dev.js',
 200  'wp-admin/js/slug.js',
 201  'wp-includes/gettext.php',
 202  'wp-includes/js/tinymce/plugins/wordpress/js',
 203  'wp-includes/streams.php',
 204  // MU
 205  'README.txt',
 206  'htaccess.dist',
 207  'index-install.php',
 208  'wp-admin/css/mu-rtl.css',
 209  'wp-admin/css/mu.css',
 210  'wp-admin/images/site-admin.png',
 211  'wp-admin/includes/mu.php',
 212  'wp-admin/wpmu-admin.php',
 213  'wp-admin/wpmu-blogs.php',
 214  'wp-admin/wpmu-edit.php',
 215  'wp-admin/wpmu-options.php',
 216  'wp-admin/wpmu-themes.php',
 217  'wp-admin/wpmu-upgrade-site.php',
 218  'wp-admin/wpmu-users.php',
 219  'wp-includes/images/wordpress-mu.png',
 220  'wp-includes/wpmu-default-filters.php',
 221  'wp-includes/wpmu-functions.php',
 222  'wpmu-settings.php',
 223  // 3.0
 224  'wp-admin/categories.php',
 225  'wp-admin/edit-category-form.php',
 226  'wp-admin/edit-page-form.php',
 227  'wp-admin/edit-pages.php',
 228  'wp-admin/images/admin-header-footer.png',
 229  'wp-admin/images/browse-happy.gif',
 230  'wp-admin/images/ico-add.png',
 231  'wp-admin/images/ico-close.png',
 232  'wp-admin/images/ico-edit.png',
 233  'wp-admin/images/ico-viewpage.png',
 234  'wp-admin/images/fav-top.png',
 235  'wp-admin/images/screen-options-left.gif',
 236  'wp-admin/images/wp-logo-vs.gif',
 237  'wp-admin/images/wp-logo.gif',
 238  'wp-admin/import',
 239  'wp-admin/js/wp-gears.dev.js',
 240  'wp-admin/js/wp-gears.js',
 241  'wp-admin/options-misc.php',
 242  'wp-admin/page-new.php',
 243  'wp-admin/page.php',
 244  'wp-admin/rtl.css',
 245  'wp-admin/rtl.dev.css',
 246  'wp-admin/update-links.php',
 247  'wp-admin/wp-admin.css',
 248  'wp-admin/wp-admin.dev.css',
 249  'wp-includes/js/codepress',
 250  'wp-includes/js/codepress/engines/khtml.js',
 251  'wp-includes/js/codepress/engines/older.js',
 252  'wp-includes/js/jquery/autocomplete.dev.js',
 253  'wp-includes/js/jquery/autocomplete.js',
 254  'wp-includes/js/jquery/interface.js',
 255  'wp-includes/js/scriptaculous/prototype.js',
 256  'wp-includes/js/tinymce/wp-tinymce.js',
 257  // 3.1
 258  'wp-admin/edit-attachment-rows.php',
 259  'wp-admin/edit-link-categories.php',
 260  'wp-admin/edit-link-category-form.php',
 261  'wp-admin/edit-post-rows.php',
 262  'wp-admin/images/button-grad-active-vs.png',
 263  'wp-admin/images/button-grad-vs.png',
 264  'wp-admin/images/fav-arrow-vs-rtl.gif',
 265  'wp-admin/images/fav-arrow-vs.gif',
 266  'wp-admin/images/fav-top-vs.gif',
 267  'wp-admin/images/list-vs.png',
 268  'wp-admin/images/screen-options-right-up.gif',
 269  'wp-admin/images/screen-options-right.gif',
 270  'wp-admin/images/visit-site-button-grad-vs.gif',
 271  'wp-admin/images/visit-site-button-grad.gif',
 272  'wp-admin/link-category.php',
 273  'wp-admin/sidebar.php',
 274  'wp-includes/classes.php',
 275  'wp-includes/js/tinymce/blank.htm',
 276  'wp-includes/js/tinymce/plugins/media/css/content.css',
 277  'wp-includes/js/tinymce/plugins/media/img',
 278  'wp-includes/js/tinymce/plugins/safari',
 279  // 3.2
 280  'wp-admin/images/logo-login.gif',
 281  'wp-admin/images/star.gif',
 282  'wp-admin/js/list-table.dev.js',
 283  'wp-admin/js/list-table.js',
 284  'wp-includes/default-embeds.php',
 285  'wp-includes/js/tinymce/plugins/wordpress/img/help.gif',
 286  'wp-includes/js/tinymce/plugins/wordpress/img/more.gif',
 287  'wp-includes/js/tinymce/plugins/wordpress/img/toolbars.gif',
 288  'wp-includes/js/tinymce/themes/advanced/img/fm.gif',
 289  'wp-includes/js/tinymce/themes/advanced/img/sflogo.png',
 290  // 3.3
 291  'wp-admin/css/colors-classic-rtl.css',
 292  'wp-admin/css/colors-classic-rtl.dev.css',
 293  'wp-admin/css/colors-fresh-rtl.css',
 294  'wp-admin/css/colors-fresh-rtl.dev.css',
 295  'wp-admin/css/dashboard-rtl.css',
 296  'wp-admin/css/dashboard-rtl.dev.css',
 297  'wp-admin/css/dashboard.css',
 298  'wp-admin/css/dashboard.dev.css',
 299  'wp-admin/css/farbtastic-rtl.css',
 300  'wp-admin/css/global-rtl.css',
 301  'wp-admin/css/global-rtl.dev.css',
 302  'wp-admin/css/global.css',
 303  'wp-admin/css/global.dev.css',
 304  'wp-admin/css/install-rtl.css',
 305  'wp-admin/css/install-rtl.dev.css',
 306  'wp-admin/css/login-rtl.css',
 307  'wp-admin/css/login-rtl.dev.css',
 308  'wp-admin/css/login.css',
 309  'wp-admin/css/login.dev.css',
 310  'wp-admin/css/ms.css',
 311  'wp-admin/css/ms.dev.css',
 312  'wp-admin/css/nav-menu-rtl.css',
 313  'wp-admin/css/nav-menu-rtl.dev.css',
 314  'wp-admin/css/nav-menu.css',
 315  'wp-admin/css/nav-menu.dev.css',
 316  'wp-admin/css/plugin-install-rtl.css',
 317  'wp-admin/css/plugin-install-rtl.dev.css',
 318  'wp-admin/css/plugin-install.css',
 319  'wp-admin/css/plugin-install.dev.css',
 320  'wp-admin/css/press-this-rtl.css',
 321  'wp-admin/css/press-this-rtl.dev.css',
 322  'wp-admin/css/press-this.css',
 323  'wp-admin/css/press-this.dev.css',
 324  'wp-admin/css/theme-editor-rtl.css',
 325  'wp-admin/css/theme-editor-rtl.dev.css',
 326  'wp-admin/css/theme-editor.css',
 327  'wp-admin/css/theme-editor.dev.css',
 328  'wp-admin/css/theme-install-rtl.css',
 329  'wp-admin/css/theme-install-rtl.dev.css',
 330  'wp-admin/css/theme-install.css',
 331  'wp-admin/css/theme-install.dev.css',
 332  'wp-admin/css/widgets-rtl.css',
 333  'wp-admin/css/widgets-rtl.dev.css',
 334  'wp-admin/css/widgets.css',
 335  'wp-admin/css/widgets.dev.css',
 336  'wp-admin/includes/internal-linking.php',
 337  'wp-includes/images/admin-bar-sprite-rtl.png',
 338  'wp-includes/js/jquery/ui.button.js',
 339  'wp-includes/js/jquery/ui.core.js',
 340  'wp-includes/js/jquery/ui.dialog.js',
 341  'wp-includes/js/jquery/ui.draggable.js',
 342  'wp-includes/js/jquery/ui.droppable.js',
 343  'wp-includes/js/jquery/ui.mouse.js',
 344  'wp-includes/js/jquery/ui.position.js',
 345  'wp-includes/js/jquery/ui.resizable.js',
 346  'wp-includes/js/jquery/ui.selectable.js',
 347  'wp-includes/js/jquery/ui.sortable.js',
 348  'wp-includes/js/jquery/ui.tabs.js',
 349  'wp-includes/js/jquery/ui.widget.js',
 350  'wp-includes/js/l10n.dev.js',
 351  'wp-includes/js/l10n.js',
 352  'wp-includes/js/tinymce/plugins/wplink/css',
 353  'wp-includes/js/tinymce/plugins/wplink/img',
 354  'wp-includes/js/tinymce/plugins/wplink/js',
 355  'wp-includes/js/tinymce/themes/advanced/img/wpicons.png',
 356  'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/butt2.png',
 357  'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/button_bg.png',
 358  'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/down_arrow.gif',
 359  'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/fade-butt.png',
 360  'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/separator.gif',
 361  // 3.4
 362  'wp-admin/images/gray-star.png',
 363  'wp-admin/images/logo-login.png',
 364  'wp-admin/images/star.png',
 365  'wp-admin/index-extra.php',
 366  'wp-admin/network/index-extra.php',
 367  'wp-admin/user/index-extra.php',
 368  'wp-admin/images/screenshots/admin-flyouts.png',
 369  'wp-admin/images/screenshots/coediting.png',
 370  'wp-admin/images/screenshots/drag-and-drop.png',
 371  'wp-admin/images/screenshots/help-screen.png',
 372  'wp-admin/images/screenshots/media-icon.png',
 373  'wp-admin/images/screenshots/new-feature-pointer.png',
 374  'wp-admin/images/screenshots/welcome-screen.png',
 375  'wp-includes/css/editor-buttons.css',
 376  'wp-includes/css/editor-buttons.dev.css',
 377  'wp-includes/js/tinymce/plugins/paste/blank.htm',
 378  'wp-includes/js/tinymce/plugins/wordpress/css',
 379  'wp-includes/js/tinymce/plugins/wordpress/editor_plugin.dev.js',
 380  'wp-includes/js/tinymce/plugins/wordpress/img/embedded.png',
 381  'wp-includes/js/tinymce/plugins/wordpress/img/more_bug.gif',
 382  'wp-includes/js/tinymce/plugins/wordpress/img/page_bug.gif',
 383  'wp-includes/js/tinymce/plugins/wpdialogs/editor_plugin.dev.js',
 384  'wp-includes/js/tinymce/plugins/wpeditimage/css/editimage-rtl.css',
 385  'wp-includes/js/tinymce/plugins/wpeditimage/editor_plugin.dev.js',
 386  'wp-includes/js/tinymce/plugins/wpfullscreen/editor_plugin.dev.js',
 387  'wp-includes/js/tinymce/plugins/wpgallery/editor_plugin.dev.js',
 388  'wp-includes/js/tinymce/plugins/wpgallery/img/gallery.png',
 389  'wp-includes/js/tinymce/plugins/wplink/editor_plugin.dev.js',
 390  // Don't delete, yet: 'wp-pass.php', 
 391  // Don't delete, yet: 'wp-register.php',
 392  );
 393  
 394  /**
 395   * Stores new files in wp-content to copy
 396   *
 397   * The contents of this array indicate any new bundled plugins/themes which
 398   * should be installed with the WordPress Upgrade. These items will not be
 399   * re-installed in future upgrades, this behaviour is controlled by the
 400   * introduced version present here being older than the current installed version.
 401   *
 402   * The content of this array should follow the following format:
 403   * Filename (relative to wp-content) => Introduced version
 404   * Directories should be noted by suffixing it with a trailing slash (/)
 405   *
 406   * @since 3.2.0
 407   * @global array $_new_bundled_files
 408   * @var array
 409   * @name $_new_bundled_files
 410   */
 411  global $_new_bundled_files;
 412  
 413  $_new_bundled_files = array(
 414  'plugins/akismet/' => '2.0',
 415  'themes/twentyten/' => '3.0',
 416  'themes/twentyeleven/' => '3.2'
 417  );
 418  
 419  /**
 420   * Upgrade the core of WordPress.
 421   *
 422   * This will create a .maintenance file at the base of the WordPress directory
 423   * to ensure that people can not access the web site, when the files are being
 424   * copied to their locations.
 425   *
 426   * The files in the {@link $_old_files} list will be removed and the new files
 427   * copied from the zip file after the database is upgraded.
 428   *
 429   * The files in the {@link $_new_bundled_files} list will be added to the installation
 430   * if the version is greater than or equal to the old version being upgraded.
 431   *
 432   * The steps for the upgrader for after the new release is downloaded and
 433   * unzipped is:
 434   *   1. Test unzipped location for select files to ensure that unzipped worked.
 435   *   2. Create the .maintenance file in current WordPress base.
 436   *   3. Copy new WordPress directory over old WordPress files.
 437   *   4. Upgrade WordPress to new version.
 438   *     4.1. Copy all files/folders other than wp-content
 439   *     4.2. Copy any language files to WP_LANG_DIR (which may differ from WP_CONTENT_DIR
 440   *     4.3. Copy any new bundled themes/plugins to their respective locations
 441   *   5. Delete new WordPress directory path.
 442   *   6. Delete .maintenance file.
 443   *   7. Remove old files.
 444   *   8. Delete 'update_core' option.
 445   *
 446   * There are several areas of failure. For instance if PHP times out before step
 447   * 6, then you will not be able to access any portion of your site. Also, since
 448   * the upgrade will not continue where it left off, you will not be able to
 449   * automatically remove old files and remove the 'update_core' option. This
 450   * isn't that bad.
 451   *
 452   * If the copy of the new WordPress over the old fails, then the worse is that
 453   * the new WordPress directory will remain.
 454   *
 455   * If it is assumed that every file will be copied over, including plugins and
 456   * themes, then if you edit the default theme, you should rename it, so that
 457   * your changes remain.
 458   *
 459   * @since 2.7.0
 460   *
 461   * @param string $from New release unzipped path.
 462   * @param string $to Path to old WordPress installation.
 463   * @return WP_Error|null WP_Error on failure, null on success.
 464   */
 465  function update_core($from, $to) {
 466      global $wp_filesystem, $_old_files, $_new_bundled_files, $wpdb;
 467  
 468      @set_time_limit( 300 );
 469  
 470      $php_version    = phpversion();
 471      $mysql_version  = $wpdb->db_version();
 472      $required_php_version = '5.2.4';
 473      $required_mysql_version = '5.0';
 474      $wp_version = '3.4';
 475      $php_compat     = version_compare( $php_version, $required_php_version, '>=' );
 476      if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) )
 477          $mysql_compat = true;
 478      else
 479          $mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );
 480  
 481      if ( !$mysql_compat || !$php_compat )
 482          $wp_filesystem->delete($from, true);
 483  
 484      if ( !$mysql_compat && !$php_compat )
 485          return new WP_Error( 'php_mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.'), $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) );
 486      elseif ( !$php_compat )
 487          return new WP_Error( 'php_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher. You are running version %3$s.'), $wp_version, $required_php_version, $php_version ) );
 488      elseif ( !$mysql_compat )
 489          return new WP_Error( 'mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires MySQL version %2$s or higher. You are running version %3$s.'), $wp_version, $required_mysql_version, $mysql_version ) );
 490  
 491      // Sanity check the unzipped distribution
 492      apply_filters('update_feedback', __('Verifying the unpacked files&#8230;'));
 493      $distro = '';
 494      $roots = array( '/wordpress/', '/wordpress-mu/' );
 495      foreach( $roots as $root ) {
 496          if ( $wp_filesystem->exists($from . $root . 'readme.html') && $wp_filesystem->exists($from . $root . 'wp-includes/version.php') ) {
 497              $distro = $root;
 498              break;
 499          }
 500      }
 501      if ( !$distro ) {
 502          $wp_filesystem->delete($from, true);
 503          return new WP_Error('insane_distro', __('The update could not be unpacked') );
 504      }
 505  
 506      apply_filters('update_feedback', __('Installing the latest version&#8230;'));
 507  
 508      // Create maintenance file to signal that we are upgrading
 509      $maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
 510      $maintenance_file = $to . '.maintenance';
 511      $wp_filesystem->delete($maintenance_file);
 512      $wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE);
 513  
 514      // Copy new versions of WP files into place.
 515      $result = _copy_dir($from . $distro, $to, array('wp-content') );
 516  
 517      // Custom Content Directory needs updating now.
 518      // Copy Languages
 519      if ( !is_wp_error($result) && $wp_filesystem->is_dir($from . $distro . 'wp-content/languages') ) {
 520          if ( WP_LANG_DIR != ABSPATH . WPINC . '/languages' || @is_dir(WP_LANG_DIR) )
 521              $lang_dir = WP_LANG_DIR;
 522          else
 523              $lang_dir = WP_CONTENT_DIR . '/languages';
 524  
 525          if ( !@is_dir($lang_dir) && 0 === strpos($lang_dir, ABSPATH) ) { // Check the language directory exists first
 526              $wp_filesystem->mkdir($to . str_replace(ABSPATH, '', $lang_dir), FS_CHMOD_DIR); // If it's within the ABSPATH we can handle it here, otherwise they're out of luck.
 527              clearstatcache(); // for FTP, Need to clear the stat cache
 528          }
 529  
 530          if ( @is_dir($lang_dir) ) {
 531              $wp_lang_dir = $wp_filesystem->find_folder($lang_dir);
 532              if ( $wp_lang_dir )
 533                  $result = copy_dir($from . $distro . 'wp-content/languages/', $wp_lang_dir);
 534          }
 535      }
 536  
 537      // Copy New bundled plugins & themes
 538      // This gives us the ability to install new plugins & themes bundled with future versions of WordPress whilst avoiding the re-install upon upgrade issue.
 539      if ( !is_wp_error($result) && ( ! defined('CORE_UPGRADE_SKIP_NEW_BUNDLED') || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
 540          $old_version = $GLOBALS['wp_version']; // $wp_version in local scope == new version
 541          foreach ( (array) $_new_bundled_files as $file => $introduced_version ) {
 542              // If $introduced version is greater than what the site was previously running
 543              if ( version_compare($introduced_version, $old_version, '>') ) {
 544                  $directory = ('/' == $file[ strlen($file)-1 ]);
 545                  list($type, $filename) = explode('/', $file, 2);
 546  
 547                  if ( 'plugins' == $type )
 548                      $dest = $wp_filesystem->wp_plugins_dir();
 549                  elseif ( 'themes' == $type )
 550                      $dest = trailingslashit($wp_filesystem->wp_themes_dir()); // Back-compat, ::wp_themes_dir() did not return trailingslash'd pre-3.2
 551                  else
 552                      continue;
 553  
 554                  if ( ! $directory ) {
 555                      if ( $wp_filesystem->exists($dest . $filename) )
 556                          continue;
 557  
 558                      if ( ! $wp_filesystem->copy($from . $distro . 'wp-content/' . $file, $dest . $filename, FS_CHMOD_FILE) )
 559                          $result = new WP_Error('copy_failed', __('Could not copy file.'), $dest . $filename);
 560                  } else {
 561                      if ( $wp_filesystem->is_dir($dest . $filename) )
 562                          continue;
 563  
 564                      $wp_filesystem->mkdir($dest . $filename, FS_CHMOD_DIR);
 565                      $_result = copy_dir( $from . $distro . 'wp-content/' . $file, $dest . $filename);
 566                      if ( is_wp_error($_result) ) //If a error occurs partway through this final step, keep the error flowing through, but keep process going.
 567                          $result = $_result;
 568                  }
 569              }
 570          } //end foreach
 571      }
 572  
 573      // Handle $result error from the above blocks
 574      if ( is_wp_error($result) ) {
 575          $wp_filesystem->delete($maintenance_file);
 576          $wp_filesystem->delete($from, true);
 577          return $result;
 578      }
 579  
 580      // Remove old files
 581      foreach ( $_old_files as $old_file ) {
 582          $old_file = $to . $old_file;
 583          if ( !$wp_filesystem->exists($old_file) )
 584              continue;
 585          $wp_filesystem->delete($old_file, true);
 586      }
 587  
 588      // Upgrade DB with separate request
 589      apply_filters('update_feedback', __('Upgrading database&#8230;'));
 590      $db_upgrade_url = admin_url('upgrade.php?step=upgrade_db');
 591      wp_remote_post($db_upgrade_url, array('timeout' => 60));
 592  
 593      // Remove working directory
 594      $wp_filesystem->delete($from, true);
 595  
 596      // Force refresh of update information
 597      if ( function_exists('delete_site_transient') )
 598          delete_site_transient('update_core');
 599      else
 600          delete_option('update_core');
 601  
 602      // Remove maintenance file, we're done.
 603      $wp_filesystem->delete($maintenance_file);
 604  
 605      // If we made it this far:
 606      do_action( '_core_updated_successfully', $wp_version );
 607  
 608      return $wp_version;
 609  }
 610  
 611  /**
 612   * Copies a directory from one location to another via the WordPress Filesystem Abstraction.
 613   * Assumes that WP_Filesystem() has already been called and setup.
 614   *
 615   * This is a temporary function for the 3.1 -> 3.2 upgrade only and will be removed in 3.3
 616   *
 617   * @ignore
 618   * @since 3.2.0
 619   * @see copy_dir()
 620   *
 621   * @param string $from source directory
 622   * @param string $to destination directory
 623   * @param array $skip_list a list of files/folders to skip copying
 624   * @return mixed WP_Error on failure, True on success.
 625   */
 626  function _copy_dir($from, $to, $skip_list = array() ) {
 627      global $wp_filesystem;
 628  
 629      $dirlist = $wp_filesystem->dirlist($from);
 630  
 631      $from = trailingslashit($from);
 632      $to = trailingslashit($to);
 633  
 634      $skip_regex = '';
 635      foreach ( (array)$skip_list as $key => $skip_file )
 636          $skip_regex .= preg_quote($skip_file, '!') . '|';
 637  
 638      if ( !empty($skip_regex) )
 639          $skip_regex = '!(' . rtrim($skip_regex, '|') . ')$!i';
 640  
 641      foreach ( (array) $dirlist as $filename => $fileinfo ) {
 642          if ( !empty($skip_regex) )
 643              if ( preg_match($skip_regex, $from . $filename) )
 644                  continue;
 645  
 646          if ( 'f' == $fileinfo['type'] ) {
 647              if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) ) {
 648                  // If copy failed, chmod file to 0644 and try again.
 649                  $wp_filesystem->chmod($to . $filename, 0644);
 650                  if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) )
 651                      return new WP_Error('copy_failed', __('Could not copy file.'), $to . $filename);
 652              }
 653          } elseif ( 'd' == $fileinfo['type'] ) {
 654              if ( !$wp_filesystem->is_dir($to . $filename) ) {
 655                  if ( !$wp_filesystem->mkdir($to . $filename, FS_CHMOD_DIR) )
 656                      return new WP_Error('mkdir_failed', __('Could not create directory.'), $to . $filename);
 657              }
 658              $result = _copy_dir($from . $filename, $to . $filename, $skip_list);
 659              if ( is_wp_error($result) )
 660                  return $result;
 661          }
 662      }
 663      return true;
 664  }
 665  
 666  /**
 667   * Redirect to the About WordPress page after a successful upgrade.
 668   *
 669   * This function is only needed when the existing install is older than 3.3.0 (3.4.0 for multisite).
 670   *
 671   * @since 3.3.0
 672   *
 673   */
 674  function _redirect_to_about_wordpress( $new_version ) {
 675      global $wp_version, $pagenow, $action;
 676  
 677      if ( is_multisite() ) {
 678          // Change to self_admin_url().
 679          if ( version_compare( $wp_version, '3.4-alpha', '>=' ) )
 680              return;
 681      } elseif ( version_compare( $wp_version, '3.3', '>=' ) ) {
 682          return;
 683      }
 684  
 685      // Ensure we only run this on the update-core.php page. wp_update_core() could be called in other contexts.
 686      if ( 'update-core.php' != $pagenow )
 687          return;
 688  
 689       if ( 'do-core-upgrade' != $action && 'do-core-reinstall' != $action )
 690           return;
 691  
 692      // Load the updated default text localization domain for new strings
 693      load_default_textdomain();
 694  
 695      // See do_core_upgrade()
 696      show_message( __('WordPress updated successfully') );
 697      show_message( '<span class="hide-if-no-js">' . sprintf( __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click <a href="%s">here</a>.' ), $new_version, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' );
 698      show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to WordPress %1$s. <a href="%2$s">Learn more</a>.' ), $new_version, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' );
 699      echo '</div>';
 700      ?>
 701  <script type="text/javascript">
 702  window.location = '<?php echo self_admin_url( 'about.php?updated' ); ?>';
 703  </script>
 704      <?php
 705  
 706      // Include admin-footer.php and exit
 707      include (ABSPATH . 'wp-admin/admin-footer.php');
 708      exit();
 709  }
 710  add_action( '_core_updated_successfully', '_redirect_to_about_wordpress' );