What is the correct way to define variables in php

#What is the correct way to define variables in php?

For example, a basic test question about PHP variables is:

The following statement of PHP variables is correct ( )

A, $name="dadfa";

B、int i;

C、var int $a;

D、string $name="sunch";

Answer: A

PHP variable rules:

Variables start with a $ symbol, followed by the name of the variable

Variable names must start with a letter or an underscore

Variable names cannot begin with a number

Variable names can only contain alphanumeric characters and underscores (A-z, 0-9, and _)

Variable names are case-sensitive ($y and $Y are two different variables)

Note: PHP variable names are case-sensitive! If the value you assign to a variable is text, surround the value in quotes.

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