按键比较两个PHP数组 [英] compare two PHP arrays by key

问题描述

如果两个数组的键相等，比较最快的方法是什么?

What's the fastest way to compare if the keys of two arrays are equal?

例如.

array1:          array2:

'abc' => 46,     'abc' => 46,
'def' => 134,    'def' => 134,
'xyz' => 34,     'xyz' => 34, 

在这种情况下，结果应为TRUE(相同的键)

in this case result should be TRUE (same keys)

和:

array1:          array2:

'abc' => 46,     'abc' => 46,
'def' => 134,    'def' => 134,
'qwe' => 34,     'xyz' => 34, 
'xyz' => 34,    

结果应为FALSE(某些键有所不同)

result should be FALSE (some keys differ)

array_diff_key()返回一个空数组...

array_diff_key() returns a empty array...

推荐答案

使用

Use array_diff_key, that is what it is for. As you said, it returns an empty array; that is what it is supposed to do.

给出array_diff_key($array1, $array2)，如果所有array1的键都存在于array2中，它将返回一个空数组.为了确保数组相等，您需要确保所有array2的键都存在于array1中.如果任何一个调用返回一个非空数组，则说明您的数组键不相等:

Given array_diff_key($array1, $array2), it will return an empty array if all of array1's keys exist in array2. To make sure that the arrays are equal, you then need to make sure all of array2's keys exist in array1. If either call returns a non-empty array, you know your array keys aren't equal:

function keys_are_equal($array1, $array2) {
  return !array_diff_key($array1, $array2) && !array_diff_key($array2, $array1);
}

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