reverse of a number php error -

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this question has answer here:

<?php  $revs=0; $no=123; while($no!=0) { $revs = $revs*10; $revs = $revs +( $revs%10); $no = ($no/10); } echo revs;  ?>

the code written above doesn't work shows following error

"notice: use of undefined constant revs - assumed 'revs' in /opt/lampp/htdocs/testprojct/proj.php on line 26

you forgot $ in front of revs echo it.


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