PHP Variables

All variables in PHP start with a $ sign symbol. Variables may contain strings, numbers, or arrays.

Variables are used for storing values, such as numbers, strings or function results, so that they can be used many times in a script.  A variable is a means of storing a value, such as text string "Hello World!" or the integer value 4. A variable can then be reused throughout your code, instead of having to type out the actual value over and over again.
In PHP you define a variable with the following form:

$variable_name = Value;

A Quick Variable Example

Say that we wanted to store the values that we talked about in the above paragraph. How would we go about doing this? We would first want to make a variable name and then set that equal to the value we want. See our example below for the correct way to do this.

Note for programmers: PHP does not require variables to be declared before being initialized.

PHP Variable Naming Conventions

There are a few rules that you need to follow when choosing a name for your PHP variables.

• PHP variables must start with a letter or underscore "_".

• PHP variables may only be comprised of alpha-numeric characters and underscores. a-z, A-Z, 0-9, or _ .

• Variables with more than one word should be separated with underscores. $my_variable

• Variables with more than one word can also be distinguished with capitalization. $myVariable

Credits: www.tizag.com

---