Php New

For "quick learning" you can start here . For php reference guide and detailed php functions description, you can check php.net ( http://www.php.net/manual/en/ )

which software use for php code ...

Software ? you mean the editor ? There are so many. Zend studio is good, but expensive. If you want a free editor, you can use phpeclipse, devphp, notepad++ and so on.

I always use crimson (free), because it supports not only PHP-syntax highlighting, but also a lot of other languages

how to save php file and also how can check in IExplore browser

Upload it to a website that supports PHP.
Or if you want to run it local, install Apache http server and PHP

I don't know what you mean by saving a php file. If you have installed apache, you can type http://localhost/php-file-name to execute your script.

Btw, If you are new to php, I would suggest you to install wamp . Wamp is a bundled package of php, mysql and apache. Just install it and start working !

Learning PHP
check this link http://www.w3schools.com/php/default.asp, there you can learn php in very much easy way.

PHP Editor
you may use Dreanweaver, notepad or any other editor

PHP Book
if you are comitted to learn php in depth, you have to spend just 30 or 35$ for book name
PHP MySql Web Developement by luke Welling and Thomson, you may search its content table from internet