What is PHP ?
PHP or Hypertext Processor is server side open source language for web development. Currently PHP is widely used server side language because it is free to download and use. PHP is syntax is mostly borrowed from C, Java and Perl. The learning curve for PHP is very small. Any one with small practice and learning can able create a dynamic web page using it. Like C, Java and C#, PHP code not required to compile so the deployment of PHP is also very easy.
Here is the small example on How to add PHP code inside your HTML webpage.
<head><title>What is PHP ?</title></head>
<body><?php echo "Hello vLemonn !!!. I am a PHP Script"; ?></body>