请考虑以下代码构造:
condition ? code_if_true :
condition2 ? code_if_true2 :
code_if_false;
这不适用于 PHP,但适用于 JavaScript。
有没有办法让它在 PHP 上工作?
In PHP, the conditional operator is left-associative[PHP.net] http://php.net/manual/en/language.operators.precedence.php#language.operators.precedence, compared to virtually all other languages where it is right-associative.
That's why you need to use parentheses to control the order of evaluation1:
condition ? code_if_true :
(condition2 ? code_if_true2 :
code_if_false );
1The order in which which operators are resolved, not when operands are evaluated. The latter is basically undefined[PHP.net] https://bugs.php.net/bug.php?id=61188#1330283084
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