In PHP a variable start with a $ sign, followed by the name of variable: A variable can have a short name or a more descriptive name like (age, student name, section.)
Rules of PHP variable:
A variable start with $ sign, followed by the name of variable.
A variable must start with a letter or the underscore charcters.
A variable cannot start with a number.
A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ).
A variable name are case-sensitive ($age and $AGE are two different variable).
Remember that PHP variable names are case-sensitive!
The following example will show a variable;
$text = "techtooinfo is a digital blog website";
echo "I Love $text"