PHP：打印关联数组

发布于 2024-11-16 15:09:06 字数 290 浏览 2 评论 0原文

在 PHP 中，我有一个像这样的关联数组

$a = array('who' => 'one', 'are' => 'two', 'you' => 'three');

How to write a foreach 循环来遍历数组并访问数组键和值，以便我可以操作它们（换句话说，我将能够将 who 和 one 分配给两个变量 $key 和 $value？

原文

In PHP, I have an associative array like this

$a = array('who' => 'one', 'are' => 'two', 'you' => 'three');

How to write a foreach loop that goes through the array and access the array key and value so that I can manipulate them (in other words, I would be able to get who and one assigned to two variables $key and $value?

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半寸时光 2024-11-23 15:09:06

foreach ($array as $key => $value) {
    echo "Key: $key; Value: $value\n";
}

foreach ($array as $key => $value) {
    echo "Key: $key; Value: $value\n";
}

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节枝 2024-11-23 15:09:06

@Thiago 已经提到了访问密钥和相应值的方式。这当然是正确且首选的解决方案。

然而，因为你说

这样我就可以操纵它们

我想建议另外两种方法

如果您只想操纵该值，请将其作为参考访问

foreach ($array as $key => &$value) {
  $value = '一些新值';
}

如果您想同时操作键和值，则应该采用其他方式

foreach (array_keys($array) as $key) {
  $值=$数组[$键];
  取消设置($array[$key]); // 删除旧密钥
  $array['新键'] = $value; // 将值设置为新键
}

@Thiago already mentions the way to access the key and the corresponding value. This is of course the correct and preferred solution.

However, because you say

so I can manipulate them

I want to suggest two other approaches

If you only want to manipulate the value, access it as reference

foreach ($array as $key => &$value) {
  $value = 'some new value';
}

If you want to manipulate both the key and the value, you should going an other way

foreach (array_keys($array) as $key) {
  $value = $array[$key];
  unset($array[$key]); // remove old key
  $array['new key'] = $value; // set value into new key
}

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~没有更多了~