Sample member pages plugin

member-pages.php

<?php 
/*
	Plugin Name: Test Plugin
*/
function analytics_rewrite_add_var( $vars ) {
	$vars[] = 'member';
	return $vars;
}
add_filter( 'query_vars', 'analytics_rewrite_add_var' );

function add_analytic_rewrite_rule(){
	add_rewrite_tag( '%member%', '([^&]+)' );
	add_rewrite_rule(
		'^member/([^/]*)/?',
		'index.php?member=$matches[1]',
		'top'
	);
}
add_action( 'init', 'add_analytic_rewrite_rule' );

function my_parse_request( $wp ) {
	if ( ! is_admin() ) {
		if ( isset( $wp->query_vars['member'] ) && $wp->query_vars['member'] ) {
			$member = get_user_by( 'login', $wp->query_vars['member'] );
			if ( false !== $member ) {
				global $_current_member;
				$_current_member = $member;
				$wp->query_vars['page_id'] = get_my_page_id();
				add_filter( 'the_title', 'my_title_filter', 0, 2 );
				add_filter( 'single_post_title', 'my_title_filter', 0, 2 );
				add_filter( 'the_content', 'my_content_filter', 0, 2 );
			} else {
				// Set a 404 error
				$wp->query_vars['error'] = '404';
			}
		}
	}
}
add_filter( 'parse_request', 'my_parse_request', 10 );

function my_title_filter( $title, $id = false ) {
	global $_current_member;
	$id = is_object( $id ) ? $id->ID : $id;
	if ( $id == get_my_page_id() && isset( $_current_member ) ) {
		$search = array(
			'%FNAME%',
			'%LNAME%',
			'%DNAME%',
			'%UNAME%',
			'%UID%',
		);
		$replace = array(
			$_current_member->first_name,
			$_current_member->last_name,
			$_current_member->display_name,
			$_current_member->user_login,
			$_current_member->ID,
		);
		// Allow the user to define some placeholders in the page title
		// That will be replaced with the correct data for the displayed user
		return str_replace( $search, $replace, $title );
	}
	return $title;
}

function my_content_filter( $content, $id = false ) {
	global $_current_member;
	if ( ( $id == get_my_page_id() || get_the_ID() == get_my_page_id() ) && isset( $_current_member ) ) {
		ob_start();

		include_once( 'member.php' );

		return apply_filters( 'my_plugin_member_output', ob_get_clean(), $_current_member );
	}

	return $content;
}

function get_my_page_id() {
	// Cache the ID
	static $page_id;
	if ( isset( $page_id ) ) {
		return $page_id;
	}
	// Change this to $page_id = get_option( 'my_profile_page_id' );
	$page_id = 2;

	return $page_id;
}