PHP is a fast and powerful server side scripting language that allows full database interactivity.

Make use of the comprehensive online php manual.

PHP Step 1.
Download PHP and begin installation.

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PHP Step 2.
Create a new directory in you Program Files with name php like this:

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PHP Step 3.
Now edit the Apache configuration file (httpd.conf) to enable php processing. You can find the configuration file in the Apache installation directory/conf/httpd.conf. On my machine the exact location is: D:\Program Files\Apache Software Foundation\Apache2.2\conf\httpd.conf

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PHP Step 4.
Add the following 3 lines to your httpd.conf file at the end of the LoadModule section.
LoadModule php5_module "d:/Program Files/php/php5apache2_2.dll"
AddType application/x-httpd-php .php
PHPIniDir "D:\Program Files\php"

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PHP Step 5.
Now you have to restart Apache.
Start menu -> Programs -> Apache HTTP Server 2.2.3 -> Control Apache Server -> Restart

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PHP Step 6.
PHP has now been istalled. To test the installation create a new file in the Apache document root directory (D:\Program Files\Apache Software Foundation\Apache2.2\htdocs) with name info.php using a text editor such as notepad. Put the following 3 lines into this file and then save it.
?php
phpinfo();
?>

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PHP Step 7.
Let's try it out. Visit the following URL: http://loclahost/info.php You should get a page similar to this:

 

PHP is now installing. Next we shall install MySQL