Index: src/wp-signup.php
===================================================================
--- src/wp-signup.php	(revision 25618)
+++ src/wp-signup.php	(working copy)
@@ -18,6 +18,11 @@
  * @since MU
  */
 function do_signup_header() {
+	/**
+	 * Fires within the <head> section of the signup screen.
+	 *
+	 * @since 3.0.0
+	 */
 	do_action( 'signup_header' );
 }
 add_action( 'wp_head', 'do_signup_header' );
@@ -63,6 +68,11 @@
 add_action( 'wp_head', 'wpmu_signup_stylesheet' );
 get_header();
 
+/**
+ * Fires before the signup form.
+ *
+ * @since 3.0.0
+ */
 do_action( 'before_signup_form' );
 ?>
 <div id="content" class="widecolumn">
@@ -128,7 +138,12 @@
 	</div>
 
 	<?php
-	do_action('signup_blogform', $errors);
+	/**
+	 * Fires after the signup form.
+	 *
+	 * @since 3.0.0
+	 */
+	do_action( 'signup_blogform', $errors );
 }
 
 /**
@@ -176,6 +191,11 @@
 	if ( $errmsg = $errors->get_error_message('generic') ) {
 		echo '<p class="error">' . $errmsg . '</p>';
 	}
+	/**
+	 * Add extra fields to the user registration form.
+	 *
+	 * @since 3.0.0
+	 */
 	do_action( 'signup_extra_fields', $errors );
 }
 
@@ -209,8 +229,20 @@
 		$errors = new WP_Error();
 	}
 
-	// allow definition of default variables
-	$filtered_results = apply_filters('signup_another_blog_init', array('blogname' => $blogname, 'blog_title' => $blog_title, 'errors' => $errors ));
+	$signup_defaults = array(
+		'blogname'   => $blogname,
+		'blog_title' => $blog_title,
+		'errors'     => $errors
+	);
+
+	/**
+	 * Filter the default site signup variables.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param array $signup_defaults An array of default site signup variables.
+	 */
+	$filtered_results = apply_filters( 'signup_another_blog_init', $signup_defaults );
 	$blogname = $filtered_results['blogname'];
 	$blog_title = $filtered_results['blog_title'];
 	$errors = $filtered_results['errors'];
@@ -241,11 +273,11 @@
 		<input type="hidden" name="stage" value="gimmeanotherblog" />
 		<?php
 		/**
-		 * Hidden signup form fields output for creating another site.
+		 * Hidden signup form fields output when creating another site.
 		 *
 		 * @since MU
 		 *
-		 * @param string $context A string describing the step of the signup process. the value can be
+		 * @param string $context A string describing the steps of the signup process. The value can be
 		 *                        'create-another-site', 'validate-user', or 'validate-site'.
 		 */
 		do_action( 'signup_hidden_fields', 'create-another-site' );
@@ -281,7 +313,28 @@
 	}
 
 	$public = (int) $_POST['blog_public'];
-	$meta = apply_filters( 'signup_create_blog_meta', array( 'lang_id' => 1, 'public' => $public ) ); // deprecated
+
+	$blog_meta_defaults = array(
+		'lang_id' => 1,
+		'public'  => $public
+	);
+
+	/**
+	 * Filter the new blog meta variables.
+	 *
+	 * @since 3.0.0
+	 * @deprecated 3.0.0
+	 *
+	 * @param array $blog_meta_defaults An array of default blog meta variables.
+	 */
+	$meta = apply_filters( 'signup_create_blog_meta', $blog_meta_defaults );
+	/**
+	 * Filter the new default site meta variables.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param array $meta An array of default site meta variables.
+	 */
 	$meta = apply_filters( 'add_signup_meta', $meta );
 
 	wpmu_create_blog( $domain, $path, $blog_title, $current_user->ID, $meta, $wpdb->siteid );
@@ -307,6 +360,11 @@
 		<?php printf( __( '<a href="http://%1$s">http://%2$s</a> is your new site. <a href="%3$s">Log in</a> as &#8220;%4$s&#8221; using your existing password.' ), $domain.$path, $domain.$path, "http://" . $domain.$path . "wp-login.php", $user_name ) ?>
 	</p>
 	<?php
+	/**
+	 * Fires when the signup process is complete.
+	 *
+	 * @since 3.0.0
+	 */
 	do_action( 'signup_finished' );
 }
 
@@ -329,8 +387,20 @@
 
 	$signup_for = isset( $_POST[ 'signup_for' ] ) ? esc_html( $_POST[ 'signup_for' ] ) : 'blog';
 
-	// allow definition of default variables
-	$filtered_results = apply_filters('signup_user_init', array('user_name' => $user_name, 'user_email' => $user_email, 'errors' => $errors ));
+	$signup_user_default = array(
+		'user_name'  => $user_name,
+		'user_email' => $user_email,
+		'errors'     => $errors,
+	);
+
+	/**
+	 * Filter the default user variables.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param array $signup_user_default An array of default user variables.
+	 */
+	$filtered_results = apply_filters( 'signup_user_init', $signup_user_default );
 	$user_name = $filtered_results['user_name'];
 	$user_email = $filtered_results['user_email'];
 	$errors = $filtered_results['errors'];
@@ -389,8 +459,13 @@
 		return false;
 	}
 
-	wpmu_signup_user($user_name, $user_email, apply_filters( 'add_signup_meta', array() ) );
+	$optional_signup_meta = array();
 
+	//duplicate_hook
+	$meta = apply_filters( 'add_signup_meta', $optional_signup_meta );
+
+	wpmu_signup_user( $user_name, $user_email, $meta );
+
 	confirm_user_signup($user_name, $user_email);
 	return true;
 }
@@ -410,6 +485,7 @@
 	<p><?php printf( __( 'Check your inbox at <strong>%s</strong> and click the link given.' ), $user_email ); ?></p>
 	<p><?php _e( 'If you do not activate your username within two days, you will have to sign up again.' ); ?></p>
 	<?php
+	//duplicate_hook
 	do_action( 'signup_finished' );
 }
 
@@ -430,8 +506,22 @@
 	if ( !is_wp_error($errors) )
 		$errors = new WP_Error();
 
-	// allow definition of default variables
-	$filtered_results = apply_filters('signup_blog_init', array('user_name' => $user_name, 'user_email' => $user_email, 'blogname' => $blogname, 'blog_title' => $blog_title, 'errors' => $errors ));
+	$signup_blog_default = array(
+		'user_name'  => $user_name,
+		'user_email' => $user_email,
+		'blogname'   => $blogname,
+		'blog_title' => $blog_title,
+		'errors'     => $errors
+	);
+
+	/**
+	 * Filter the default site creation variables.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param array $signup_blog_default An array of default site creation variables.
+	 */
+	$filtered_results = apply_filters( 'signup_blog_init', $signup_blog_default );
 	$user_name = $filtered_results['user_name'];
 	$user_email = $filtered_results['user_email'];
 	$blogname = $filtered_results['blogname'];
@@ -487,6 +577,8 @@
 
 	$public = (int) $_POST['blog_public'];
 	$meta = array ('lang_id' => 1, 'public' => $public);
+
+	//duplicate_hook
 	$meta = apply_filters( 'add_signup_meta', $meta );
 
 	wpmu_signup_blog($domain, $path, $blog_title, $user_name, $user_email, $meta);
@@ -523,12 +615,21 @@
 		</ul>
 	</p>
 	<?php
+	//duplicate_hook
 	do_action( 'signup_finished' );
 }
 
 // Main
 $active_signup = get_site_option( 'registration', 'none' );
-$active_signup = apply_filters( 'wpmu_active_signup', $active_signup ); // return "all", "none", "blog" or "user"
+/**
+ * Filter the type of signup.
+ *
+ * @since 3.0.0
+ *
+ * @param string $active_signup String that returns registration type. The value can be
+ *                              'all', 'none', 'blog', or 'user'.
+ */
+$active_signup = apply_filters( 'wpmu_active_signup', $active_signup );
 
 // Make the signup type translatable.
 $i18n_signup['all'] = _x('all', 'Multisite active signup type');
@@ -568,7 +669,12 @@
 		case 'default':
 		default :
 			$user_email = isset( $_POST[ 'user_email' ] ) ? $_POST[ 'user_email' ] : '';
-			do_action( 'preprocess_signup_form' ); // populate the form from invites, elsewhere?
+			/**
+			 * Fires when the signup form is sent.
+			 *
+			 * @since 3.0.0
+			 */
+			do_action( 'preprocess_signup_form' );
 			if ( is_user_logged_in() && ( $active_signup == 'all' || $active_signup == 'blog' ) )
 				signup_another_blog($newblogname);
 			elseif ( is_user_logged_in() == false && ( $active_signup == 'all' || $active_signup == 'user' ) )
@@ -592,6 +698,12 @@
 ?>
 </div>
 </div>
-<?php do_action( 'after_signup_form' ); ?>
+<?php
+/**
+ * Fires after the signup form, before wp_footer.
+ *
+ * @since 3.0.0
+ */
+do_action( 'after_signup_form' ); ?>
 
 <?php get_footer(); ?>
