Variable in php

     Variable is the very important concept for storing and reading the data using variable, in php assign the variable should start with $ symbol.

Variable creation rules for php

1. Variable should start with dollar($) symbol.
2. Variable should not start with number(1,2,3,4,etc...)
3. Variable should start with letter or underscore (a-z,A-Z and _)
4. Variable should contain alpha-numeric characters and underscrore (a-z,A-Z,0-9 and _)
5. Variables are case sensitive (eg, $test and $TEST are different)

Example Program

<?php
 $num1 = 5;
 $num2 = 10;

 echo $num1+$num2;
?>

output
  15