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   1  <?php
   2  /**
   3   * These functions are needed to load WordPress.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Turn register globals off.
  10   *
  11   * @access private
  12   * @since 2.1.0
  13   * @return null Will return null if register_globals PHP directive was disabled
  14   */
  15  function wp_unregister_GLOBALS() {
  16      if ( !ini_get( 'register_globals' ) )
  17          return;
  18  
  19      if ( isset( $_REQUEST['GLOBALS'] ) )
  20          die( /*WP_I18N_GLOBALS_OVERWRITE*/'GLOBALS overwrite attempt detected'/*/WP_I18N_GLOBALS_OVERWRITE*/ );
  21  
  22      // Variables that shouldn't be unset
  23      $no_unset = array( 'GLOBALS', '_GET', '_POST', '_COOKIE', '_REQUEST', '_SERVER', '_ENV', '_FILES', 'table_prefix' );
  24  
  25      $input = array_merge( $_GET, $_POST, $_COOKIE, $_SERVER, $_ENV, $_FILES, isset( $_SESSION ) && is_array( $_SESSION ) ? $_SESSION : array() );
  26      foreach ( $input as $k => $v )
  27          if ( !in_array( $k, $no_unset ) && isset( $GLOBALS[$k] ) ) {
  28              $GLOBALS[$k] = null;
  29              unset( $GLOBALS[$k] );
  30          }
  31  }
  32  
  33  /**
  34   * Fix $_SERVER variables for various setups.
  35   *
  36   * @access private
  37   * @since 3.0.0
  38   */
  39  function wp_fix_server_vars() {
  40      global $PHP_SELF;
  41  
  42      $default_server_values = array(
  43          'SERVER_SOFTWARE' => '',
  44          'REQUEST_URI' => '',
  45      );
  46  
  47      $_SERVER = array_merge( $default_server_values, $_SERVER );
  48  
  49      // Fix for IIS when running with PHP ISAPI
  50      if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
  51  
  52          // IIS Mod-Rewrite
  53          if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
  54              $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
  55          }
  56          // IIS Isapi_Rewrite
  57          else if ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
  58              $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
  59          } else {
  60              // Use ORIG_PATH_INFO if there is no PATH_INFO
  61              if ( !isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) )
  62                  $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
  63  
  64              // Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
  65              if ( isset( $_SERVER['PATH_INFO'] ) ) {
  66                  if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
  67                      $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
  68                  else
  69                      $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
  70              }
  71  
  72              // Append the query string if it exists and isn't null
  73              if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
  74                  $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
  75              }
  76          }
  77      }
  78  
  79      // Fix for PHP as CGI hosts that set SCRIPT_FILENAME to something ending in php.cgi for all requests
  80      if ( isset( $_SERVER['SCRIPT_FILENAME'] ) && ( strpos( $_SERVER['SCRIPT_FILENAME'], 'php.cgi' ) == strlen( $_SERVER['SCRIPT_FILENAME'] ) - 7 ) )
  81          $_SERVER['SCRIPT_FILENAME'] = $_SERVER['PATH_TRANSLATED'];
  82  
  83      // Fix for Dreamhost and other PHP as CGI hosts
  84      if ( strpos( $_SERVER['SCRIPT_NAME'], 'php.cgi' ) !== false )
  85          unset( $_SERVER['PATH_INFO'] );
  86  
  87      // Fix empty PHP_SELF
  88      $PHP_SELF = $_SERVER['PHP_SELF'];
  89      if ( empty( $PHP_SELF ) )
  90          $_SERVER['PHP_SELF'] = $PHP_SELF = preg_replace( '/(\?.*)?$/', '', $_SERVER["REQUEST_URI"] );
  91  }
  92  
  93  /**
  94   * Check for the required PHP version, and the MySQL extension or a database drop-in.
  95   *
  96   * Dies if requirements are not met.
  97   *
  98   * @access private
  99   * @since 3.0.0
 100   */
 101  function wp_check_php_mysql_versions() {
 102      // we can probably extend this function to check if wp_die() exists then use translated strings, and then use it in install.php etc.
 103  
 104      global $required_php_version, $wp_version;
 105      $php_version = phpversion();
 106      if ( version_compare( $required_php_version, $php_version, '>' ) )
 107          die( sprintf( /*WP_I18N_OLD_PHP*/'Your server is running PHP version %1$s but WordPress %2%s requires at least %2%s.'/*/WP_I18N_OLD_PHP*/, $php_version, $wp_version, $required_php_version ) );
 108  
 109      if ( !extension_loaded( 'mysql' ) && !file_exists( WP_CONTENT_DIR . '/db.php' ) )
 110          die( /*WP_I18N_OLD_MYSQL*/'Your PHP installation appears to be missing the MySQL extension which is required by WordPress.'/*/WP_I18N_OLD_MYSQL*/ );
 111  }
 112  
 113  /**
 114   * Don't load all of WordPress when handling a favicon.ico request.
 115   * Instead, send the headers for a zero-length favicon and bail.
 116   *
 117   * @since 3.0.0
 118   */
 119  function wp_favicon_request() {
 120      if ( '/favicon.ico' == $_SERVER['REQUEST_URI'] ) {
 121          header('Content-Type: image/vnd.microsoft.icon');
 122          header('Content-Length: 0');
 123          exit;
 124      }
 125  }
 126  
 127  /**
 128   * Dies with a maintenance message when conditions are met.
 129   *
 130   * Checks for a file in the WordPress root directory named ".maintenance".
 131   * This file will contain the variable $upgrading, set to the time the file
 132   * was created. If the file was created less than 10 minutes ago, WordPress
 133   * enters maintenance mode and displays a message.
 134   *
 135   * The default message can be replaced by using a drop-in (maintenance.php in
 136   * the wp-content directory).
 137   *
 138   * @access private
 139   * @since 3.0.0
 140   */
 141  function wp_maintenance() {
 142      if ( !file_exists( ABSPATH . '.maintenance' ) || defined( 'WP_INSTALLING' ) )
 143          return;
 144  
 145      include( ABSPATH . '.maintenance' );
 146      // If the $upgrading timestamp is older than 10 minutes, don't die.
 147      if ( ( time() - $upgrading ) >= 600 )
 148          return;
 149  
 150      if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) {
 151          require_once( WP_CONTENT_DIR . '/maintenance.php' );
 152          die();
 153      }
 154  
 155      $protocol = $_SERVER["SERVER_PROTOCOL"];
 156      if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
 157          $protocol = 'HTTP/1.0';
 158      header( "$protocol 503 Service Unavailable", true, 503 );
 159      header( 'Content-Type: text/html; charset=utf-8' );
 160      header( 'Retry-After: 600' );
 161  ?>
 162      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 163      <html xmlns="http://www.w3.org/1999/xhtml">
 164      <head>
 165      <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 166          <title><?php echo /*WP_I18N_MAINTENANCE*/'Maintenance'/*/WP_I18N_MAINTENANCE*/; ?></title>
 167  
 168      </head>
 169      <body>
 170          <h1><?php echo /*WP_I18N_MAINT_MSG*/'Briefly unavailable for scheduled maintenance. Check back in a minute.'/*/WP_I18N_MAINT_MSG*/; ?></h1>
 171      </body>
 172      </html>
 173  <?php
 174      die();
 175  }
 176  
 177  /**
 178   * PHP 4 standard microtime start capture.
 179   *
 180   * @access private
 181   * @since 0.71
 182   * @global int $timestart Seconds and Microseconds added together from when function is called.
 183   * @return bool Always returns true.
 184   */
 185  function timer_start() {
 186      global $timestart;
 187      $mtime = explode( ' ', microtime() );
 188      $timestart = $mtime[1] + $mtime[0];
 189      return true;
 190  }
 191  
 192  /**
 193   * Return and/or display the time from the page start to when function is called.
 194   *
 195   * You can get the results and print them by doing:
 196   * <code>
 197   * $nTimePageTookToExecute = timer_stop();
 198   * echo $nTimePageTookToExecute;
 199   * </code>
 200   *
 201   * Or instead, you can do:
 202   * <code>
 203   * timer_stop(1);
 204   * </code>
 205   * which will do what the above does. If you need the result, you can assign it to a variable, but
 206   * most cases, you only need to echo it.
 207   *
 208   * @since 0.71
 209   * @global int $timestart Seconds and Microseconds added together from when timer_start() is called
 210   * @global int $timeend  Seconds and Microseconds added together from when function is called
 211   *
 212   * @param int $display Use '0' or null to not echo anything and 1 to echo the total time
 213   * @param int $precision The amount of digits from the right of the decimal to display. Default is 3.
 214   * @return float The "second.microsecond" finished time calculation
 215   */
 216  function timer_stop( $display = 0, $precision = 3 ) { // if called like timer_stop(1), will echo $timetotal
 217      global $timestart, $timeend;
 218      $mtime = microtime();
 219      $mtime = explode( ' ', $mtime );
 220      $timeend = $mtime[1] + $mtime[0];
 221      $timetotal = $timeend - $timestart;
 222      $r = ( function_exists( 'number_format_i18n' ) ) ? number_format_i18n( $timetotal, $precision ) : number_format( $timetotal, $precision );
 223      if ( $display )
 224          echo $r;
 225      return $r;
 226  }
 227  
 228  /**
 229   * Sets PHP error handling and handles WordPress debug mode.
 230   *
 231   * Uses three constants: WP_DEBUG, WP_DEBUG_DISPLAY, and WP_DEBUG_LOG. All three can be
 232   * defined in wp-config.php. Example: <code> define( 'WP_DEBUG', true ); </code>
 233   *
 234   * WP_DEBUG_DISPLAY and WP_DEBUG_LOG perform no function unless WP_DEBUG is true.
 235   * WP_DEBUG defaults to false.
 236   *
 237   * When WP_DEBUG is true, all PHP notices are reported. WordPress will also display
 238   * notices, including one when a deprecated WordPress function, function argument,
 239   * or file is used. Deprecated code may be removed from a later version.
 240   *
 241   * It is strongly recommended that plugin and theme developers use WP_DEBUG in their
 242   * development environments.
 243   *
 244   * When WP_DEBUG_DISPLAY is true, WordPress will force errors to be displayed.
 245   * WP_DEBUG_DISPLAY defaults to true. Defining it as false prevents WordPress from
 246   * changing the global configuration setting. (Defining WP_DEBUG_DISPLAY as false
 247   * will never force errors to be hidden.)
 248   *
 249   * When WP_DEBUG_LOG is true, errors will be logged to wp-content/debug.log.
 250   * WP_DEBUG_LOG defaults to false.
 251   *
 252   * @access private
 253   * @since 3.0.0
 254   */
 255  function wp_debug_mode() {
 256      if ( WP_DEBUG ) {
 257          if ( defined( 'E_DEPRECATED' ) )
 258              error_reporting( E_ALL & ~E_DEPRECATED & ~E_STRICT );
 259          else
 260              error_reporting( E_ALL );
 261  
 262          if ( WP_DEBUG_DISPLAY )
 263              ini_set( 'display_errors', 1 );
 264  
 265          if ( WP_DEBUG_LOG ) {
 266              ini_set( 'log_errors', 1 );
 267              ini_set( 'error_log', WP_CONTENT_DIR . '/debug.log' );
 268          }
 269      } else {
 270          if ( defined( 'E_RECOVERABLE_ERROR' ) )
 271              error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
 272          else
 273              error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING );
 274      }
 275  }
 276  
 277  /**
 278   * Sets the location of the language directory.
 279   *
 280   * To set directory manually, define <code>WP_LANG_DIR</code> in wp-config.php.
 281   *
 282   * First looks for language folder in WP_CONTENT_DIR and uses that folder if it
 283   * exists. Or it uses the "languages" folder in WPINC.
 284   *
 285   * The WP_LANG_DIR constant was introduced in 2.1.0.
 286   *
 287   * @access private
 288   * @since 3.0.0
 289   */
 290  function wp_set_lang_dir() {
 291      if ( !defined( 'WP_LANG_DIR' ) ) {
 292          if ( file_exists( WP_CONTENT_DIR . '/languages' ) && @is_dir( WP_CONTENT_DIR . '/languages' ) ) {
 293              define( 'WP_LANG_DIR', WP_CONTENT_DIR . '/languages' ); // no leading slash, no trailing slash, full path, not relative to ABSPATH
 294              if ( !defined( 'LANGDIR' ) ) {
 295                  // Old static relative path maintained for limited backwards compatibility - won't work in some cases
 296                  define( 'LANGDIR', 'wp-content/languages' );
 297              }
 298          } else {
 299              define( 'WP_LANG_DIR', ABSPATH . WPINC . '/languages' ); // no leading slash, no trailing slash, full path, not relative to ABSPATH
 300              if ( !defined( 'LANGDIR' ) ) {
 301                  // Old relative path maintained for backwards compatibility
 302                  define( 'LANGDIR', WPINC . '/languages' );
 303              }
 304          }
 305      }
 306  }
 307  
 308  /**
 309   * Sets the database table prefix and the format specifiers for database table columns.
 310   *
 311   * Columns not listed here default to %s.
 312   *
 313   * @see wpdb::$field_types Since 2.8.0
 314   * @see wpdb::prepare()
 315   * @see wpdb::insert()
 316   * @see wpdb::update()
 317   * @see wpdb::set_prefix()
 318   *
 319   * @access private
 320   * @since 3.0.0
 321   */
 322  function wp_set_wpdb_vars() {
 323      global $wpdb, $table_prefix;
 324      if ( !empty( $wpdb->error ) )
 325          dead_db();
 326  
 327      $wpdb->field_types = array( 'post_author' => '%d', 'post_parent' => '%d', 'menu_order' => '%d', 'term_id' => '%d', 'term_group' => '%d', 'term_taxonomy_id' => '%d',
 328          'parent' => '%d', 'count' => '%d','object_id' => '%d', 'term_order' => '%d', 'ID' => '%d', 'commment_ID' => '%d', 'comment_post_ID' => '%d', 'comment_parent' => '%d',
 329          'user_id' => '%d', 'link_id' => '%d', 'link_owner' => '%d', 'link_rating' => '%d', 'option_id' => '%d', 'blog_id' => '%d', 'meta_id' => '%d', 'post_id' => '%d',
 330          'user_status' => '%d', 'umeta_id' => '%d', 'comment_karma' => '%d', 'comment_count' => '%d',
 331          // multisite:
 332          'active' => '%d', 'cat_id' => '%d', 'deleted' => '%d', 'lang_id' => '%d', 'mature' => '%d', 'public' => '%d', 'site_id' => '%d', 'spam' => '%d',
 333      );
 334  
 335      $prefix = $wpdb->set_prefix( $table_prefix );
 336  
 337      if ( is_wp_error( $prefix ) )
 338          wp_die( /*WP_I18N_BAD_PREFIX*/'<strong>ERROR</strong>: <code>$table_prefix</code> in <code>wp-config.php</code> can only contain numbers, letters, and underscores.'/*/WP_I18N_BAD_PREFIX*/ );
 339  }
 340  
 341  /**
 342   * Starts the WordPress object cache.
 343   *
 344   * If an object-cache.php file exists in the wp-content directory,
 345   * it uses that drop-in as an external object cache.
 346   *
 347   * @access private
 348   * @since 3.0.0
 349   */
 350  function wp_start_object_cache() {
 351      $first_init = false;
 352       if ( ! function_exists( 'wp_cache_init' ) ) {
 353          global $_wp_using_ext_object_cache;
 354          if ( file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
 355              require_once ( WP_CONTENT_DIR . '/object-cache.php' );
 356              $_wp_using_ext_object_cache = true;
 357          } else {
 358              require_once  ( ABSPATH . WPINC . '/cache.php' );
 359              $_wp_using_ext_object_cache = false;
 360          }
 361          $first_init = true;
 362      }
 363  
 364      // If cache supports reset, reset instead of init if already initialized.
 365      // Reset signals to the cache that global IDs have changed and it may need to update keys
 366      // and cleanup caches.
 367      if ( !$first_init && function_exists('wp_cache_reset') )
 368          wp_cache_reset();
 369      else
 370          wp_cache_init();
 371  
 372      if ( function_exists( 'wp_cache_add_global_groups' ) ) {
 373          wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'site-transient', 'site-options', 'site-lookup', 'blog-lookup', 'blog-details', 'rss' ) );
 374          wp_cache_add_non_persistent_groups( array( 'comment', 'counts', 'plugins' ) );
 375      }
 376  }
 377  
 378  /**
 379   * Redirects to the installer if WordPress is not installed.
 380   *
 381   * Dies with an error message when multisite is enabled.
 382   *
 383   * @access private
 384   * @since 3.0.0
 385   */
 386  function wp_not_installed() {
 387      if ( is_multisite() ) {
 388          if ( ! is_blog_installed() && ! defined( 'WP_INSTALLING' ) )
 389              wp_die( __( 'The blog you have requested is not installed properly. Please contact the system administrator.' ) );
 390      } elseif ( ! is_blog_installed() && false === strpos( $_SERVER['PHP_SELF'], 'install.php' ) && !defined( 'WP_INSTALLING' ) ) {
 391          if ( defined( 'WP_SITEURL' ) )
 392              $link = WP_SITEURL . '/wp-admin/install.php';
 393          elseif ( false !== strpos( $_SERVER['PHP_SELF'], 'wp-admin' ) )
 394              $link = preg_replace( '|/wp-admin/?.*?$|', '/', $_SERVER['PHP_SELF'] ) . 'wp-admin/install.php';
 395          else
 396              $link = preg_replace( '|/[^/]+?$|', '/', $_SERVER['PHP_SELF'] ) . 'wp-admin/install.php';
 397          require ( ABSPATH . WPINC . '/kses.php' );
 398          require ( ABSPATH . WPINC . '/pluggable.php' );
 399          require ( ABSPATH . WPINC . '/formatting.php' );
 400          wp_redirect( $link );
 401          die();
 402      }
 403  }
 404  
 405  /**
 406   * Returns array of must-use plugin files to be included in global scope.
 407   *
 408   * The default directory is wp-content/mu-plugins. To change the default directory
 409   * manually, define <code>WPMU_PLUGIN_DIR</code> and <code>WPMU_PLUGIN_URL</code>
 410   * in wp-config.php.
 411   *
 412   * @access private
 413   * @since 3.0.0
 414   * @return array Files to include
 415   */
 416  function wp_get_mu_plugins() {
 417      $mu_plugins = array();
 418      if ( !is_dir( WPMU_PLUGIN_DIR ) )
 419          return $mu_plugins;
 420      if ( ! $dh = opendir( WPMU_PLUGIN_DIR ) )
 421          return $mu_plugins;
 422      while ( ( $plugin = readdir( $dh ) ) !== false ) {
 423          if ( substr( $plugin, -4 ) == '.php' )
 424              $mu_plugins[] = WPMU_PLUGIN_DIR . '/' . $plugin;
 425      }
 426      closedir( $dh );
 427      sort( $mu_plugins );
 428  
 429      return $mu_plugins;
 430  }
 431  
 432  /**
 433   * Returns array of plugin files to be included in global scope.
 434   *
 435   * The default directory is wp-content/plugins. To change the default directory
 436   * manually, define <code>WP_PLUGIN_DIR</code> and <code>WP_PLUGIN_URL</code>
 437   * in wp-config.php.
 438   *
 439   * @access private
 440   * @since 3.0.0
 441   * @return array Files to include
 442   */
 443  function wp_get_active_and_valid_plugins() {
 444      $plugins = array();
 445      $active_plugins = (array) get_option( 'active_plugins', array() );
 446  
 447      // Get active network plugins
 448      if ( is_multisite() ) {
 449          $active_sitewide_plugins = (array) get_site_option( 'active_sitewide_plugins', array() );
 450          if ( !empty($active_sitewide_plugins) ) {
 451              $active_plugins = array_merge( $active_plugins, array_keys( $active_sitewide_plugins ) );
 452              sort( $active_plugins );
 453          }
 454      }
 455  
 456      // Check for hacks file if the option is enabled
 457      if ( get_option( 'hack_file' ) && file_exists( ABSPATH . 'my-hacks.php' ) ) {
 458          _deprecated_file( 'my-hacks.php', '1.5' );
 459          array_unshift( $plugins, ABSPATH . 'my-hacks.php' );
 460      }
 461  
 462      if ( empty( $active_plugins ) || defined( 'WP_INSTALLING' ) )
 463          return $plugins;
 464  
 465      foreach ( $active_plugins as $plugin ) {
 466          if ( ! validate_file( $plugin ) // $plugin must validate as file
 467              && '.php' == substr( $plugin, -4 ) // $plugin must end with '.php'
 468              && file_exists( WP_PLUGIN_DIR . '/' . $plugin ) // $plugin must exist
 469              )
 470          $plugins[] = WP_PLUGIN_DIR . '/' . $plugin;
 471      }
 472      return $plugins;
 473  }
 474  
 475  /**
 476   * Sets internal encoding using mb_internal_encoding().
 477   *
 478   * In most cases the default internal encoding is latin1, which is of no use,
 479   * since we want to use the mb_ functions for utf-8 strings.
 480   *
 481   * @access private
 482   * @since 3.0.0
 483   */
 484  function wp_set_internal_encoding() {
 485      if ( function_exists( 'mb_internal_encoding' ) ) {
 486          if ( !@mb_internal_encoding( get_option( 'blog_charset' ) ) )
 487              mb_internal_encoding( 'UTF-8' );
 488      }
 489  }
 490  
 491  /**
 492   * Add magic quotes to $_GET, $_POST, $_COOKIE, and $_SERVER.
 493   *
 494   * Also forces $_REQUEST to be $_GET + $_POST. If $_SERVER, $_COOKIE,
 495   * or $_ENV are needed, use those superglobals directly.
 496   *
 497   * @access private
 498   * @since 3.0.0
 499   */
 500  function wp_magic_quotes() {
 501      // If already slashed, strip.
 502      if ( get_magic_quotes_gpc() ) {
 503          $_GET    = stripslashes_deep( $_GET    );
 504          $_POST   = stripslashes_deep( $_POST   );
 505          $_COOKIE = stripslashes_deep( $_COOKIE );
 506      }
 507  
 508      // Escape with wpdb.
 509      $_GET    = add_magic_quotes( $_GET    );
 510      $_POST   = add_magic_quotes( $_POST   );
 511      $_COOKIE = add_magic_quotes( $_COOKIE );
 512      $_SERVER = add_magic_quotes( $_SERVER );
 513  
 514      // Force REQUEST to be GET + POST.
 515      $_REQUEST = array_merge( $_GET, $_POST );
 516  }
 517  
 518  /**
 519   * Runs just before PHP shuts down execution.
 520   *
 521   * @access private
 522   * @since 1.2.0
 523   */
 524  function shutdown_action_hook() {
 525      do_action( 'shutdown' );
 526      wp_cache_close();
 527  }
 528  
 529  /**
 530   * Copy an object.
 531   *
 532   * Returns a cloned copy of an object.
 533   *
 534   * @since 2.7.0
 535   *
 536   * @param object $object The object to clone
 537   * @return object The cloned object
 538   */
 539  function wp_clone( $object ) {
 540      static $can_clone;
 541      if ( !isset( $can_clone ) )
 542          $can_clone = version_compare( phpversion(), '5.0', '>=' );
 543  
 544      return $can_clone ? clone( $object ) : $object;
 545  }
 546  
 547  /**
 548   * Whether the current request is in WordPress admin Panel
 549   *
 550   * Does not inform on whether the user is an admin! Use capability checks to
 551   * tell if the user should be accessing a section or not.
 552   *
 553   * @since 1.5.1
 554   *
 555   * @return bool True if inside WordPress administration pages.
 556   */
 557  function is_admin() {
 558      if ( defined( 'WP_ADMIN' ) )
 559          return WP_ADMIN;
 560      return false;
 561  }
 562  
 563  /**
 564   * Whether Multisite support is enabled
 565   *
 566   * @since 3.0.0
 567   *
 568   * @return bool True if multisite is enabled, false otherwise.
 569   */
 570  function is_multisite() {
 571      if ( ( defined( 'MULTISITE' ) && MULTISITE ) || defined( 'VHOST' ) || defined( 'SUNRISE' ) )
 572          return true;
 573  
 574      return false;
 575  }
 576  
 577  ?>