variable r defined using the $ symbol.for ex: $x,$value etc.
u can even asign the values directly like $x=10 or $x='php';

php is a loosely typed language i.e without declaring a
variable we can use that,in this variable defined by using $
symbol for example $x

ya i agree with priyanka, as she said in php variables r 
loosely typed in the sense that , for example if u r wrking 
in c and u want to assign int value to a variable then it 
is done as int x=3; but in case of php the values r not 
assigned along with the data type like int $x=3; (same as 
above) instead its only $x=3; and the php parser 
understands that it is int type and works accordingly.

hope u guys got it!!!

Variables in PHP declared with $ symbol. ex: $x.