A variable contains a value that can be used over and over again within your PHP code. A variable can contain a numeric, alphabetical, or alphanumeric value.
PHP Variable Syntax
The correct syntax for creating a variable is:
$variablename = value;
Each variable must begin with a dollar sign ($).
Each variable name must begin with a letter or underscore (_).
Each variable name can only contain alphanumeric characters and underscores (_).
Variable names are case sensitive, so “VariableName” is different than “variablename”.
The following are examples of PHP variables:
$firstname = "John";
$lastname = "Robinson";
$age = "26";
The variables can then be used later in the code:
This bit of code would display:
Also see PHP strings.