Use of Ampersand in php

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Hi everybody,
 Can any one tell me, what is the use of ampersand '&' in php? Is it
a pointer operator like 'C' language? Kindly note the example....

<?php
$a=1;
$b=& $a;
$c=$a;
echo $b,$c;
?>

 After running this example I got result 1 for both variable $b and
$c. Why so?

--Nirmalya

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