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Variables in PHP
Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive, so $myvar is different from $myVar.

A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores.
Example :

PHP Superglobals
Superglobals are variables that available anywhere in the program code. They are :
$_SERVERVariables set by the web server or otherwise directly related to the execution environment of the current script. One useful variable is $_SERVER['REMOTE_ADDR'] which you can use to know you website visitor’s IP address

Variable Scope
The scope of a variable is the context within which it is defined. Basically you can not access a variable which is defined in different scope.
The script below will not produce any output because the function Test() declares no $a variable. The echo statement looks for a local version of the $a variable, and it has not been assigned a value within this scope. Depending on error_reporting value in php.ini the script below will print nothing or issue an error message.

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Now we will continue to Complete this PHP tutorial

Using Comments
Comment is a part of your PHP code that will not be translated by the PHP engine. You can use it to write documentation of your PHP script describing what the code should do. A comment can span only for one line or span multiple line.

PHP support three kinds of comment tags :
1. //This is a one line comment
2. #This is a Unix shell-style comment. It’s also a one line comment
3. /* ….. */Use this multi line comment if you need to.

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