PHP variables


A variable containing data or values. Variables are used to store and manipulate information within programs. Variables can have short names (such as a or b) or more descriptive names (name, age, total_result).

  • PHP is a loosely typed language, so there is no need to declare data types for variables.
  • Variables start with a $ symbol followed by the name of the variable
  • Variable name must start with a letter or underscore variable name cannot start with a number
  • Variable names can only contain alphanumeric characters and underscores (A-z, 0-9, and _).
  • Variable names are case-sensitive ($user and $USER are two different variables).
  • Assign a text value to a variable and enclose the value in quotes.

Example 
<?php
$str = "Welcome";
echo $str;
?>

Output

Welcome
Example 
<?php
$a= 10;
$b=15;
$c=$a+$b;
echo $c;
?>

Output

25

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