In PHP, variables are used to store and manipulate data. it is like container which allowed to hold something, after that we can manipulate it, we can perform operations on it.
In Simple word variables are used to store values.
Points to be remember
Variable Naming:
- Choose descriptive and meaningful variable names that indicate the purpose or content of the variable.
- Use lowercase letters for variable names. It’s a common convention in PHP to use snake_case (e.g.,
$user_name) for variable names.
Case Sensitivity:
- Remember that variable names in PHP are case-sensitive.
$myVarand$myvarare considered two different variables.
Start with a Letter or Underscore:
- Variable names must start with a letter (a-z, A-Z) or an underscore (_).
No Spaces or Special Characters:
- Variable names cannot contain spaces, special characters (except underscores), or reserved words. Avoid using symbols like @, $, %, etc., in variable names.
Avoid Using Reserved Words:
- PHP has a set of reserved words that have special meanings and cannot be used as variable names. Avoid using these reserved words as variable names.
Use Descriptive Variable Names:
- Choose variable names that clearly convey the purpose or content of the variable. This makes your code more readable and understandable.
Here's an example of good variable naming and usage:
$first_name = "John";
$last_name = "Doe";
$user_age = 30;
$is_active = true;