Answer:-

Here are the most important things to know about variables in PHP. • All variables in PHP are denoted with a leading dollar sign ($). • The value of a variable is the value of its most recent assignment. • Variables are assigned with the = operator, with the variable on the left-hand side and the expression to be evaluated on the right. • Variables can, but do not need, to be declared before assignment. • Variables in PHP do not have intrinsic types - a variable does not know in advance whether it will be used to store a number or a string of characters. • Variables used before they are assigned have default values. • PHP does a good job of automatically converting types from one to another when necessary. • PHP variables are Perl-like.