isset PHP isset($ _ GET ['something'])吗? $ _GET ['something']:'' [英] isset PHP isset($_GET['something']) ? $_GET['something'] : ''

问题描述

我希望扩展自己的PHP知识，但是遇到了一些不确定的东西，甚至不确定如何搜索.我正在查看php.net isset代码，并且看到了isset($_GET['something']) ? $_GET['something'] : ''

I am looking to expand on my PHP knowledge, and I came across something I am not sure what it is or how to even search for it. I am looking at php.net isset code, and I see isset($_GET['something']) ? $_GET['something'] : ''

我理解正常的isset操作，例如if(isset($_GET['something']){ If something is exists, then it is set and we will do something }，但我不理解?，再次重复get，:或''.有人可以帮我解决这个问题，或者至少将我指向正确的方向吗?

I understand normal isset operations, such as if(isset($_GET['something']){ If something is exists, then it is set and we will do something } but I don't understand the ?, repeating the get again, the : or the ''. Can someone help break this down for me or at least point me in the right direction?

推荐答案

通常称为简写"或表示

if(isset($_GET['something'])) {
    $test = $_GET['something'];
} else {
    $test = '';
}

要分解它:

$test = ... // assign variable
isset(...) // test
? ... // if test is true, do ... (equivalent to if)
: ... // otherwise... (equivalent to else)

或者...

// test --v
if(isset(...)) { // if test is true, do ... (equivalent to ?)
    $test = // assign variable
} else { // otherwise... (equivalent to :)

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