为什么php三元运算符输出错误？ [重复]

Question

This question already has an answer here:

• corresponding nested ternary operator in php? 2 answers

I have already seen the thread PHP ternary operator error

I have seen the thread mentioned above and am using parenthesis but still it doesn't give the expected output.

<?php
    $ch = 'A';
    $ans = (($ch == 'C') ? 'Cccc'
        : ($ch == 'A') ? 'Aaaa'
        : ($ch == 'G') ? 'Ggggg'
        : ($ch == 'Y') ? 'Yyyyy'
        : 'unknown');
    echo $ans;
    echo "
";
?>

This outputs Yyyyy and not Aaaa as expected. Can anyone explain why ?

</div>

Answer 1

The braces is not placed right way. Try this

$ch = 'A';
    $ans = ($ch == 'C' ? 'Cccc' :
         ($ch == 'A' ? 'Aaaa' :
         ($ch == 'G' ? 'Ggggg' : 
         ($ch == 'Y' ? 'Yyyyy':
         'unknown'))));
    echo $ans;
    echo "
";