php字符串变量包含作为数组函数的输入

发布于 2024-09-14 08:13:12 字数 648 浏览 7 评论 0原文

为什么这不起作用？

  $stringhaha ="     1 => General,
      2 => Business,
      3 => Entertainment,
      4 => Health,
      5 => Politics,
      6 => Sci/Tech,
      7 => Sports,
      8 => News";

$all_categories = array($stringhaha);

print_r($all_categories);

（将给出一个包含 1 项的数组。）

虽然这有效：如果我包含这样的变量内容，它将正确创建一个包含 8 个项目的数组：

$all_categories = array(1 => General,
      2 => Business,
      3 => Entertainment,
      4 => Health,
      5 => Politics,
      6 => Sci/Tech,
      7 => Sports,
      8 => News);

print_r($all_categories);

原文

Why this does not work?

  $stringhaha ="     1 => General,
      2 => Business,
      3 => Entertainment,
      4 => Health,
      5 => Politics,
      6 => Sci/Tech,
      7 => Sports,
      8 => News";

$all_categories = array($stringhaha);

print_r($all_categories);

(will give an array with 1 item.)

While this works:
If I include the variable content like this it will create properly an array with 8 items:

$all_categories = array(1 => General,
      2 => Business,
      3 => Entertainment,
      4 => Health,
      5 => Politics,
      6 => Sci/Tech,
      7 => Sports,
      8 => News);

print_r($all_categories);

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み青杉依旧 2024-09-21 08:13:13

正在发生的事情正是您所期望的：您已经声明了一个包含一个字符串的数组。

对于我们人类来说，你的字符串看起来像一个数组并不重要，PHP 仅仅是 PHP，并且无法神奇地检测到你希望它从字符串解析数组。

giorgio79，来认识一下 PHP Docs，你的新好朋友。

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简美 2024-09-21 08:13:13

这就是所谓的语言语法。你不能为所欲为。你必须说出它的设计方式。

这也不起作用

message = hello

为什么？因为它在语法上不正确。这同样适用于您的数组示例。

这是正确的

$message = 'hello';

每种语言都有规则，你必须尊重它们。祝你好运。

It's called language syntax. You cannot do whatever you want. You have to speak the language how it was designed.

This doesn't work either

message = hello

Why? Because it's not syntactically correct. Same applies for your example with array.

This is correct

$message = 'hello';

Every language has rules and you have to respect them. Good luck.

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￠蛋碎的人ぎ生 2024-09-21 08:13:13

我认为正确的语法是：

$all_categories = array(1 => "General",
    2 => "Business",
    3 => "Entertainment",
    4 => "Health",
    5 => "Politics",
    6 => "Sci/Tech",
    7 => "Sports",
    8 => "News");

print_r($all_categories);

您确实想要一个字符串数组，对吧？

I think the correct syntax is:

$all_categories = array(1 => "General",
    2 => "Business",
    3 => "Entertainment",
    4 => "Health",
    5 => "Politics",
    6 => "Sci/Tech",
    7 => "Sports",
    8 => "News");

print_r($all_categories);

You do want an array of strings, right?

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