5 Golden Rules of PHP Variables
While declaring a variable in PHP, we have to follow a few rules.
1. PHP variable must start with a $ sign.
2. The very first character after the $ sign must be either a letter or a underscore. Letters are the English alphabets A to Z. The letter can be lowercase or uppercase.
3. From second character onwards, we can use letters, numbers, and underscore.
4. PHP variables are case-sensitive. It means two variables with same name and different cases forms two different variables. $name, $Name, and $NAME are three different variables in PHP.
5. PHP is a loosely typed language. So, there is no need to declare a variable before using it. We can declare a variable and start using it.