PHP数组组合最佳方法

发布于 2024-09-25 13:05:59 字数 541 浏览 1 评论 0 原文

给定 php 中的以下数组，我怎样才能最好地将它们合并在一起

$masterkeys = array('Key1','Key2');

$settings_foo = array(
     array('ID'=>'Key1',
           'Foo_Setting'=>'SomeValue'));

$settings_bar = array(
     array('ID'=>'Key1',
           'Bar_Setting'=>'SomeOtherValue'));

，最后我需要 $masterkeys 作为每个 settings_[foo|bar] 数组的组合。

Array( ['Key1'] =  Array('Foo_Setting'=>'SomeValue','Bar_Setting'=>'SomeOtherValue') );

我确实知道我可以对此使用几个 foreach 循环，但只是想知道是否有几个 PHP 数组函数可以将它们拼接在一起。

原文

given the following arrays in php, how can i best merge them together

$masterkeys = array('Key1','Key2');

$settings_foo = array(
     array('ID'=>'Key1',
           'Foo_Setting'=>'SomeValue'));

$settings_bar = array(
     array('ID'=>'Key1',
           'Bar_Setting'=>'SomeOtherValue'));

in the end I need $masterkeys to be the combination of each of the settings_[foo|bar] arrays.

Array( ['Key1'] =  Array('Foo_Setting'=>'SomeValue','Bar_Setting'=>'SomeOtherValue') );

I do know I can use a couple foreach loops on this, but just wondering if there are a couple PHP array functions that can splice them together.

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指尖微凉心微凉 2024-10-02 13:05:59

虽然您可以使用 PHP 的一些数组函数，但您的输入数据的格式不是很好。通过自己编写它们，您将获得最少的迭代（并且可能获得最好的性能）：

# create an array of $masterkey => array()
$result = array_combine($masterkeys, array_fill(0, count($masterkeys), array()));

# loop through each settings array
foreach (array($settings_foo, $settings_bar) as $settings)
{
  foreach ($settings as $s)
  {
    # merge the array only if the ID is in the master list
    $key = $s['ID'];
    if (array_key_exists($key, $result))    
      $result[$key] = array_merge($result[$key], $s);
  }
}

# unset all extraneous 'ID' properties
foreach (array_keys($result) as $i)
  unset($result[$i]['ID']);

var_dump($result);

作为替代方案，您可以查看 array_map 和 array_filter，但由于数据是结构化的，我不确定它们会有多大用处。

While you can use some of PHP's array functions, your input data isn't in a very nice format. You'll have the fewest iterations (and probably best performance) by writing them yourself:

# create an array of $masterkey => array()
$result = array_combine($masterkeys, array_fill(0, count($masterkeys), array()));

# loop through each settings array
foreach (array($settings_foo, $settings_bar) as $settings)
{
  foreach ($settings as $s)
  {
    # merge the array only if the ID is in the master list
    $key = $s['ID'];
    if (array_key_exists($key, $result))    
      $result[$key] = array_merge($result[$key], $s);
  }
}

# unset all extraneous 'ID' properties
foreach (array_keys($result) as $i)
  unset($result[$i]['ID']);

var_dump($result);

As an alternative, you could look into array_map and array_filter, but due to the way the data is structured, I'm not sure they'll be of much use.