ternary operator

[fahim]

Hi someone asks me the output of the following code when two integer values pass for $m and $n:

<?php

function run($m, $n)

{

return ($n == 0) ? $m: run($n, $m % $n);

}

?>

 

I am confused about this . So please explain the output for better understanding.

Thanks.

Edited August 23, 2012 by fahim

[falkencreative]

See

 

http://www.johnhok.com/2008/02/23/php-tip-tertiary-operator/

http://php.net/manual/en/language.operators.comparison.php (example #2)

[fahim]

Still in confusing. Please would let me know something about the output of the code?

[khanahk]

The syntax

return ($n == 0) ? $m: run($n, $m % $n);

means... If $n is 0, return $m; If not, return run($n, $m % $n) and is identical in functionality to this:

if ($n==0)
 return $m;
else
 return run($n, $m % $n);

 

 

So if $n is 0 the function runs and spits out $m.

 

If $n is not 0 the function will run AGAIN but this time using the remainder of $m / $n for argument $n..

Edited August 24, 2012 by khanahk