unusual ternary operation

Question

I was asked to perform this operation of ternary operator use:

$test=\'one\';

echo $test == \'one\' ? \'one\' :  $test == \'two\' ? \'two\' : \'three\';
         


        

Answer 1

I think that it is evaluated like this:

echo ($test == 'one' ? 'one' :  $test == 'two') ? 'two' : 'three';

($test == 'one' ? 'one' : $test == 'two') is non-zero/null, so 'two' is logical output

if you want it to work correctly, write:

echo $test == 'one' ? 'one' :  ($test == 'two' ? 'two' : 'three');