如何在 php 数组中添加条件? [英] How can I add a condition inside a php array?

问题描述

这是数组

$anArray = 数组(第一项" =>第一项"，如果是真的){条件项目" =>它可能会根据条件出现"，}最后一项" =>最后一项");

但是我得到了 PHP Parse 错误，为什么我可以在数组中添加一个条件，发生了什么??:

<块引用>

PHP 解析错误:语法错误，意外的 T_IF，期待 ')'

解决方案

不幸的是，这根本不可能.

如果有项目但值为 NULL 没有问题，请使用:

$anArray = 数组(第一项" =>第一项"，条件项目" =>$条件?它可能会根据条件出现":NULL，最后一项" =>最后一项");

否则你必须这样做:

$anArray = 数组(第一项" =>第一项"，最后一项" =>最后一项");如果($条件){$anArray['conditionalItem'] = "它可能会根据条件出现";}

如果顺序重要，那就更丑了:

$anArray = array("theFirstItem" => "a first item");如果($条件){$anArray['conditionalItem'] = "它可能会根据条件出现";}$anArray['theLastItem'] = "最后一项";

不过，您可以使这更具可读性:

$anArray = array();$anArray['theFirstItem'] = "第一项";如果($条件){$anArray['conditionalItem'] = "它可能会根据条件出现";}$anArray['theLastItem'] = "最后一项";

Here is the array

$anArray = array(
   "theFirstItem" => "a first item",
   if(True){
     "conditionalItem" => "it may appear base on the condition",
   }
   "theLastItem"  => "the last item"

);

But I get the PHP Parse error, why I can add a condition inside the array, what's happen??:

PHP Parse error:  syntax error, unexpected T_IF, expecting ')'

解决方案

Unfortunately that's not possible at all.

If having the item but with a NULL value is ok, use this:

$anArray = array(
   "theFirstItem" => "a first item",
   "conditionalItem" => $condition ? "it may appear base on the condition" : NULL,
   "theLastItem"  => "the last item"
);

Otherwise you have to do it like that:

$anArray = array(
   "theFirstItem" => "a first item",
   "theLastItem"  => "the last item"
);

if($condition) {
   $anArray['conditionalItem'] = "it may appear base on the condition";
}

If the order matters, it'll be even uglier:

$anArray = array("theFirstItem" => "a first item");
if($condition) {
   $anArray['conditionalItem'] = "it may appear base on the condition";
}
$anArray['theLastItem'] = "the last item";

You could make this a little bit more readable though:

$anArray = array();
$anArray['theFirstItem'] = "a first item";
if($condition) {
   $anArray['conditionalItem'] = "it may appear base on the condition";
}
$anArray['theLastItem'] = "the last item";

这篇关于如何在 php 数组中添加条件?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！