Variables are used to store information or a value to its. Like other programming language php have its own variable .but in php there is no need to define its data type it will be automatically regret its vale that it is of integer or character type.
In php variable define with a sigh of ‘$’ i.e.
$a, $abc etc.
The first character after $ must be character or underscore. The remaining character in name may be letter , number or underscore.
$variable_name = value;