1. Compile and build libxml2

   Download libxml2 source code
   Download and extract libxml2 source code

   sudo ./configure
   sudo make
   sudo make install

2. Compile and build and configure php with apache web server

   Download and extract PHP source code
   
   ./configure -prefix=/usr/local/php5 --with-apxs2=/usr/local/apache2/bin/apxs -with-libxml-dir=/usr/local --with-mysqli=/usr/local/mysql/bin/mysql_config

   sudo make
   sudo make install
   sudo cp php.ini-development /usr/local/lib/php.in
   modify php.ini as in below steps
   
   a) include_path = "/usr/local/php5/lib/php:/usr/local/php5/include/php"
   b) error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED & ~E_WARNING
   c) extension_dir = "/usr/local/php5/lib/php/extensions/no-debug-non-zts-20180731/"
   d) configure apache for php (httpd.conf)
         AddType application/x-httpd-php .php .phtml
         AddType application/x-httpd-php-source .phps
   e) uncomment
         Include conf/extra/httpd-vhosts.conf
   f) add index.php in below directive
       
          DirectoryIndex index.html index.php
       
3. Configure httpd-vhosts.conf under /usr/local/apache2/conf/extra for webroot

   
    DocumentRoot "/usr/local/apache2/htdocs/mywebroot/public_html"
    ServerName localhost
    ServerAlias localhost
    ErrorLog "logs/localhost-error_log"
    CustomLog "logs/localhost-access_log" common
   

   "mywebroot" is the name of your choice

4. Create "index.php" in /usr/local/apache2/htdocs/mywebroot/public_html
5. Goto browser and type http://localhost/