PHP - Variables

What do you know about PHP variables ?
A variable is a means of storing a value,such as text string "Hello World" or the integer value.
In PHP you define a variable with the following form :

PHP Variable declaration:
• $variable_name = "value";

Example:
• $myString = "Hello";

Note:
Keep it on your mind,
If you forget that dollar sign at the beginning, it will not work. this is a common mistake for new programmer!

You also remember that, variable names are case-sensitive. So use the exact same capitalization when you using a variable.

The variables $a_market and $A_market are different variable in PHP's eyes.

PHP Variable Naming Conventions :

There are some rules that you need to follow when choosing a name for a variables.

• PHP Variables must be start a letter or underscore " _ ".
• 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]