Most important Rules for PHP Variables

Here are some most important rules to remember before declaring PHP Variables.

• A PHP Variable must start with a letter (A-Z, a-z) or underscore (_).

• It can only contain alpha-numeric characters (A-Z, a-z, 0-9) and underscore (_).

• PHP Variable name should not contain spaces. If it contains more than one word then it will be separated by underscore ($emp_salary) or capitalization ($empSalary)

• PHP Variable name can be any length.

• PHP Variable are case sensitive. Means Uppercase letter PHP Variables are and lowercase Letter PHP Variables are not the same. For example. $stdname and $stdName are not the same Variable.