使用嵌套三元运算符 [英] Using nested ternary operators

问题描述

我一直在尝试使用嵌套形式的isset()，如下所示:

I've been trying to use isset() in nested form like below:

isset($_POST['selectedTemplate'])?$_POST['selectedTemplate']:isset($_GET['selectedTemplate'])?$_GET['selectedTemplate']:0

但似乎我缺少了一些东西.谁能协助我做这件事?

But seems I'm missing something. Can anyone assist me how to do it?

推荐答案

将其括在括号中:

$selectedTemplate = isset($_POST['selectedTemplate'])
                  ? $_POST['selectedTemplate']
                  : (
                       isset($_GET['selectedTemplate'])
                       ? $_GET['selectedTemplate']
                       : 0
                  );

或更妙的是，使用正确的if/else语句(出于可维护性):

Or even better, use a proper if/else statement (for maintainability):

$selectTemplate = 0;

if (isset($_POST['selectedTemplate'])) {
    $selectTemplate = $_POST['selectedTemplate'];
} elseif (isset($_GET['selectedTemplate'])) {
    $selectTemplate = $_GET['selectedTemplate'];
}

---

但是，正如其他人指出的那样:使用$_REQUEST会更简单:

---

However, as others have pointed out: it would simply be easier for you to use $_REQUEST:

$selectedTemplate = isset($_REQUEST['selectedTemplate'])
                  ? $_REQUEST['selectedTemplate']
                  : 0;

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