civicrm.php

    $setting = CRM_Core_BAO_Setting::getItem('CiviCRM Preferences', 'wpLoadPhp');

    // if we don't have one, create it
    if ( is_null( $setting ) ) {
      CRM_Core_BAO_Setting::setItem($path, 'CiviCRM Preferences', 'wpLoadPhp');
    }

    // is it different to the one we've stored?
    if ( $setting !== $path ) {
      // yes - set new path (this could be because we've changed server or location)
      CRM_Core_BAO_Setting::setItem($path, 'CiviCRM Preferences', 'wpLoadPhp');
    }

  }


  /**
   * Perform necessary stuff prior to CiviCRM being loaded on the front end
   * This needs to be a method because it can then be hooked into WP at the
   * right time
   *
   * @return void
   */
  public function front_end_page_load() {

    static $frontend_loaded = FALSE;
    if ( $frontend_loaded ) {
      return;
    }

    // add resources for front end
    $this->add_core_resources( TRUE );

    // merge CiviCRM's HTML header with the WordPress theme's header
    add_action( 'wp_head', array( $this, 'wp_head' ) );

    // set flag so this only happens once
    $frontend_loaded = TRUE;

  }


  /**
   * Load only the CiviCRM CSS. This is needed because $this->front_end_page_load()
   * is only called when there is a single Civi entity present on a page or archive
   * and, whilst we don't want all the Javascript to load, we do want stylesheets
   *
   * @return void
   */
  public function front_end_css_load() {

    static $frontend_css_loaded = FALSE;
    if ( $frontend_css_loaded ) {
      return;
    }

    if (!$this->initialize()) {
      return;
    }

    $config = CRM_Core_Config::singleton();

    // default custom CSS to standalone
    $dependent = NULL;

    // Load core CSS
    if (!CRM_Core_BAO_Setting::getItem(CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME, 'disable_core_css')) {

      // enqueue stylesheet
      wp_enqueue_style(
        'civicrm_css',
        $config->resourceBase . 'css/civicrm.css',
        NULL, // dependencies
        CIVICRM_PLUGIN_VERSION, // version
        'all' // media
      );

      // custom CSS is dependent
      $dependent = array( 'civicrm_css' );

    }

    // Load custom CSS
    if (!empty($config->customCSSURL)) {
      wp_enqueue_style(
        'civicrm_custom_css',
        $config->customCSSURL,
        $dependent, // dependencies
        CIVICRM_PLUGIN_VERSION, // version
        'all' // media
      );
    }

    // set flag so this only happens once
    $frontend_css_loaded = TRUE;

  }


  /**
   * Add CiviCRM core resources
   *
   * @param bool $front_end True if on WP front end, false otherwise
   * @return void
   */
  public function add_core_resources( $front_end = TRUE ) {

    if (!$this->initialize()) {
      return;
    }

    $config = CRM_Core_Config::singleton();
    $config->userFrameworkFrontend = $front_end;

    // add CiviCRM core resources
    CRM_Core_Resources::singleton()->addCoreResources();

  }


  /**
   * Merge CiviCRM's HTML header with the WordPress theme's header
   * Callback from WordPress 'admin_head' and 'wp_head' hooks
   *
   * @return void
   */
  public function wp_head() {

    // CRM-11823 - If Civi bootstrapped, then merge its HTML header with the CMS's header
    global $civicrm_root;
    if ( empty( $civicrm_root ) ) {
      return;
    }

    $region = CRM_Core_Region::instance('html-header', FALSE);
    if ( $region ) {
      echo '<!-- CiviCRM html header -->';
      echo $region->render( '' );
    }

  }


  // ---------------------------------------------------------------------------
  // CiviCRM Invocation (this outputs Civi's markup)
  // ---------------------------------------------------------------------------


  /**
   * Invoke CiviCRM in a WordPress context
   * Callback function from add_menu_page()
   * Callback from WordPress 'init' and 'the_content' hooks
   * Also called by shortcode_render() and _civicrm_update_user()
   *
   * @return void
   */
  public function invoke() {

    static $alreadyInvoked = FALSE;
    if ( $alreadyInvoked ) {
      return;
    }

    // bail if this is called via a content-preprocessing plugin
    if ( $this->is_page_request() && !in_the_loop() && !is_admin() ) {
      return;
    }

    if (!$this->initialize()) {
      return;
    }

    // CRM-12523
    // WordPress has it's own timezone calculations
    // Civi relies on the php default timezone which WP
    // overrides with UTC in wp-settings.php
    $wpBaseTimezone = date_default_timezone_get();
    $wpUserTimezone = get_option('timezone_string');
    if ($wpUserTimezone) {
      date_default_timezone_set($wpUserTimezone);
      CRM_Core_Config::singleton()->userSystem->setMySQLTimeZone();
    }

    // CRM-95XX
    // At this point we are calling a CiviCRM function
    // WP always quotes the request, CiviCRM needs to reverse what it just did
    $this->remove_wp_magic_quotes();

    // Code inside invoke() requires the current user to be set up
    $current_user = wp_get_current_user();

    /**
     * Bypass synchronize if running upgrade to avoid any serious non-recoverable
     * error which might hinder the upgrade process.
     */
    if ( CRM_Utils_Array::value('q', $_GET) != 'civicrm/upgrade' ) {
      $this->users->sync_user( $current_user );
    }

    // set flag
    $alreadyInvoked = TRUE;

    // get args
    $argdata = $this->get_request_args();

    // set dashboard as default if args are empty
   if ( !isset( $_GET['q'] ) ) {
      $_GET['q']      = 'civicrm/dashboard';
      $_GET['reset']  = 1;
      $argdata['args'] = array('civicrm', 'dashboard');
    }

    // do the business
    CRM_Core_Invoke::invoke($argdata['args']);

    // restore WP's timezone
    if ($wpBaseTimezone) {
      date_default_timezone_set($wpBaseTimezone);
    }

    // restore WP's arrays
    $this->restore_wp_magic_quotes();

    // notify plugins
    do_action( 'civicrm_invoked' );

  }


  /**
   * Non-destructively override WordPress magic quotes
   * Only called by invoke() to undo WordPress default behaviour
   * CMW: Should probably be a private method
   *
   * @return void
   */
  public function remove_wp_magic_quotes() {

    // save original arrays
    $this->wp_get     = $_GET;
    $this->wp_post    = $_POST;
    $this->wp_cookie  = $_COOKIE;
    $this->wp_request = $_REQUEST;

    // reassign globals
    $_GET     = stripslashes_deep($_GET);
    $_POST    = stripslashes_deep($_POST);
    $_COOKIE  = stripslashes_deep($_COOKIE);
    $_REQUEST = stripslashes_deep($_REQUEST);

  }


  /**
   * Restore WordPress magic quotes
   * Only called by invoke() to redo WordPress default behaviour
   * CMW: Should probably be a private method
   *
   * @return void
   */
  public function restore_wp_magic_quotes() {

    // restore original arrays
    $_GET     = $this->wp_get;
    $_POST    = $this->wp_post;
    $_COOKIE  = $this->wp_cookie;
    $_REQUEST = $this->wp_request;

  }


  /**
   * Detect Ajax, snippet, or file requests
   *
   * @return boolean True if request is for a CiviCRM page, false otherwise
   */
  public function is_page_request() {

    // kick out if not CiviCRM
    if (!$this->initialize()) {
      return;
    }

    // get args
    $argdata = $this->get_request_args();

    // FIXME: It's not sustainable to hardcode a whitelist of all of non-HTML
    // pages. Maybe the menu-XML should include some metadata to make this
    // unnecessary?
    if (CRM_Utils_Array::value('HTTP_X_REQUESTED_WITH', $_SERVER) == 'XMLHttpRequest'
        || ($argdata['args'][0] == 'civicrm' && in_array($argdata['args'][1], array('ajax', 'file')) )
        || !empty($_REQUEST['snippet'])
        || strpos($argdata['argString'], 'civicrm/event/ical') === 0 && empty($_GET['html'])
        || strpos($argdata['argString'], 'civicrm/contact/imagefile') === 0
    ) {
      return FALSE;
    }
    else {
      return TRUE;
    }
  }


  /**
   * Get arguments and request string from $_GET
   *
   * @return array $argdata Array containing request arguments and request string
   */
  public function get_request_args() {

    $argString = NULL;
    $args = array();
    if (isset( $_GET['q'])) {
      $argString = trim($_GET['q']);
      $args = explode('/', $argString);
    }
    $args = array_pad($args, 2, '');

    return array(
      'args' => $args,
      'argString' => $argString
    );

  }

  /**
   * Add CiviCRM's title to the header's <title>
   *
   * @param string $title
   * @return string
   */
  public function set_admin_title($title) {
    global $civicrm_wp_title;
    if (!$civicrm_wp_title) {
      return $title;
    }
    // Replace 1st occurance of "CiviCRM" in the title
    $pos = strpos($title, 'CiviCRM');
    if ($pos !== FALSE) {
      return substr_replace($title, $civicrm_wp_title, $pos, 7);
    }
    return $civicrm_wp_title;
  }


  /**
   * Override a WordPress page title with the CiviCRM entity title
   * Callback method for 'single_page_title' hook, always called from WP front-end
   *
   * @param string $post_title The title of the WordPress page or post
   * @param object $post The WordPress post object the title applies to
   * @return string $civicrm_wp_title The title of the CiviCRM entity
   */
  public function single_page_title( $post_title, $post ) {

    // sanity check and override
    global $civicrm_wp_title;
    if (!empty($civicrm_wp_title)) {
      return $civicrm_wp_title;
    }

    // fallback
    return $post_title;

  }


  /**
   * Remove edit link from page content
   * Callback from 'edit_post_link' hook
   *
   * @return string Always empty
   */
  public function clear_edit_post_link() {
    return '';
  }


  /**
   * Remove edit link in WP Admin Bar
   * Callback from 'wp_before_admin_bar_render' hook
   *
   * @return void
   */
  public function clear_edit_post_menu_item() {

    // access object
    global $wp_admin_bar;

    // bail if in admin
    if ( is_admin() ) return;

    // remove the menu item from front end
    $wp_admin_bar->remove_menu( 'edit' );

  }


  /**
   * Clone of CRM_Utils_System_WordPress::getBaseUrl() whose access is set to
   * private. Until it is public, we cannot access the URL of the basepage since
   * CRM_Utils_System_WordPress::url()
   *
   * @param bool $absolute Passing TRUE prepends the scheme and domain, FALSE doesn't
   * @param bool $frontend Passing FALSE returns the admin URL
   * @param $forceBackend Passing TRUE overrides $frontend and returns the admin URL
   * @return mixed|null|string
   */
  public function get_base_url($absolute, $frontend, $forceBackend) {
    $config    = CRM_Core_Config::singleton();

    if (!isset($config->useFrameworkRelativeBase)) {
      $base = parse_url($config->userFrameworkBaseURL);
      $config->useFrameworkRelativeBase = $base['path'];
    }

    $base = $absolute ? $config->userFrameworkBaseURL : $config->useFrameworkRelativeBase;

    if ((is_admin() && !$frontend) || $forceBackend) {
      $base .= admin_url( 'admin.php' );
      return $base;
    }
    elseif (defined('CIVICRM_UF_WP_BASEPAGE')) {
      $base .= CIVICRM_UF_WP_BASEPAGE;
      return $base;
    }
    elseif (isset($config->wpBasePage)) {
      $base .= $config->wpBasePage;
      return $base;
    }

    return $base;
  }


} // class CiviCRM_For_WordPress ends


/*
--------------------------------------------------------------------------------
Procedures start here
--------------------------------------------------------------------------------
*/


/**
 * The main function responsible for returning the CiviCRM_For_WordPress instance
 * to functions everywhere.
 *
 * Use this function like you would a global variable, except without needing
 * to declare the global.
 *
 * Example: $civi = civi_wp();
 *
 * @return CiviCRM_For_WordPress instance
 */
function civi_wp() {
  return CiviCRM_For_WordPress::singleton();
}


/**
 * Hook CiviCRM_For_WordPress early onto the 'plugins_loaded' action.
 *
 * This gives all other plugins the chance to load before CiviCRM, to get their
 * actions, filters, and overrides setup without CiviCRM being in the way.
 */
if ( defined( 'CIVICRM_LATE_LOAD' ) ) {
  add_action( 'plugins_loaded', 'civi_wp', (int) CIVICRM_LATE_LOAD );

// initialize
} else {
  civi_wp();
}


/**
 * Tell WordPress to call plugin activation method - no longer calls legacy
 * global scope function
 */
register_activation_hook( CIVICRM_PLUGIN_FILE, array( civi_wp(), 'activate' ) );


/**
 * Tell WordPress to call plugin deactivation method - needed in order to reset
 * the option that is set on activation.
 */
register_deactivation_hook( CIVICRM_PLUGIN_FILE, array( civi_wp(), 'deactivate' ) );


// uninstall uses the 'uninstall.php' method
// see: http://codex.wordpress.org/Function_Reference/register_uninstall_hook



/*
--------------------------------------------------------------------------------
The global scope functions below are to maintain backwards compatibility with
previous versions of the CiviCRM WordPress plugin.
--------------------------------------------------------------------------------
*/


/**
 * add CiviCRM access capabilities to WordPress roles
 * Called by postProcess() in civicrm/CRM/ACL/Form/WordPress/Permissions.php
 * Also a callback for the 'init' hook in civi_wp()->register_hooks()
 */
function wp_civicrm_capability() {
  civi_wp()->users->set_access_capabilities();
}

/**
 * Test if CiviCRM is currently being displayed in WordPress
 * Called by setTitle() in civicrm/CRM/Utils/System/WordPress.php
 * Also called at the top of this plugin file to determine AJAX status
 */
function civicrm_wp_in_civicrm() {
  return civi_wp()->civicrm_in_wordpress();
}

/**
 * This was the original name of the initialization function and is
 * retained for backward compatibility
 */
function civicrm_wp_initialize() {
  return civi_wp()->initialize();
}

/**
 * Initialize CiviCRM. Call this function from other modules too if
 * they use the CiviCRM API.
 */
function civicrm_initialize() {
  return civi_wp()->initialize();
}

/**
 * Callback from 'edit_post_link' hook to remove edit link in civicrm_set_post_blank()
 */
function civicrm_set_blank() {
  return civi_wp()->clear_edit_post_link();
}

/**
 * Authentication function used by civicrm_wp_frontend()
 */
function civicrm_check_permission( $args ) {
  return civi_wp()->users->check_permission( $args );
}

/**
 * Called when authentication fails in civicrm_wp_frontend()
 */
function civicrm_set_frontendmessage() {
  return civi_wp()->users->get_permission_denied();
}

/**
 * Invoke CiviCRM in a WordPress context
 * Callback function from add_menu_page()
 * Callback from WordPress 'init' and 'the_content' hooks
 * Also used by civicrm_wp_shortcode_includes() and _civicrm_update_user()
 */
function civicrm_wp_invoke() {
  civi_wp()->invoke();
}

/**
 * Method that runs only when civicrm plugin is activated.
 */
function civicrm_activate() {
  civi_wp()->activate();
}

/**
 * Function to create anonymous_user' role, if 'anonymous_user' role is not in the wordpress installation
 * and assign minimum capabilities for all wordpress roles
 * This function is called on plugin activation and also from upgrade_4_3_alpha1()
 */
function civicrm_wp_set_capabilities() {
  civi_wp()->users->set_wp_user_capabilities();
}

/**
 * Callback function for add_options_page() that runs the CiviCRM installer
 */
function civicrm_run_installer() {
  civi_wp()->run_installer();
}

/**
 * Function to get the contact type
 * @param string $default contact type
 * @return $ctype contact type
 */
function civicrm_get_ctype( $default = NULL ) {
  return civi_wp()->users->get_civicrm_contact_type( $default );
}

/**
 * Getter function for global $wp_set_breadCrumb
 * Called by appendBreadCrumb() in civicrm/CRM/Utils/System/WordPress.php
 */
function wp_get_breadcrumb() {
  global $wp_set_breadCrumb;
  return $wp_set_breadCrumb;
}

/**
 * Setter function for global $wp_set_breadCrumb
 * Called by appendBreadCrumb() in civicrm/CRM/Utils/System/WordPress.php
 * Called by resetBreadCrumb() in civicrm/CRM/Utils/System/WordPress.php
 */
function wp_set_breadcrumb( $breadCrumb ) {
  global $wp_set_breadCrumb;
  $wp_set_breadCrumb = $breadCrumb;
  return $wp_set_breadCrumb;
}


/**
 * Incorporate WP-CLI Integration
 * Based on drush civicrm functionality, work done by Andy Walker
 * https://github.com/andy-walker/wp-cli-civicrm
 */
if ( defined('WP_CLI') && WP_CLI ) {
  // changed from __DIR__ because of possible symlink issues
  include_once CIVICRM_PLUGIN_DIR . 'wp-cli/civicrm.php';
}