1.Why the output of the following programme is b ?

Question

<?php
$a="b";
$b="c";
$c="a";
for($i=0;$i<1;$i++)
$c=$c;
echo $c;
?>

Answer 1

Loop runs only once. So,
$c = $c
=> $c = $($c)
=> $c = $(a)
=> $c = b

Answer 2

php has this neat thing where it can identify the name of a variable in the value of another.
I this case, $c == a
so $c would be $a
And $a is initialized to "b" above.

Answer 3

it is because $c is like saying
$(value_of_$c) --> $a --> b