多维数组的多值搜索未在PHP中返回预期结果

Question

我正在尝试构建一个允许搜索多维数组的函数，其中每个子数组都匹配多个条件。我遇到一个奇怪的行为，无法弄清为什么会发生。

以下是导致问题的一般逻辑。我在PHP 7.4上运行它的价值。最终的键数组（$keys2）应该与第一个键数组（$keys）匹配，但是它将失去与期望索引的关联。看来PHP忽略了我给定的int索引，而是在最后的array_keys()调用上使用了看不见的0索引。

$array = [
    ['one' => 'aa', 'two' => 'qq'],
    ['one' => 'bb', 'two' => 'qq'],
    ['one' => 'aa', 'two' => 'qq'],
    ['one' => 'bb', 'two' => 'qq'],
    ['one' => 'aa', 'two' => 'qq'],
];

$keys = array_keys(array_column($array, 'one'), 'aa');
$array2 = array_filter($array, static function($key) use ($keys) {
    return in_array($key, $keys, true);
}, ARRAY_FILTER_USE_KEY);
$keys2 = array_keys(array_column($array2, 'two'), 'qq');

echo '<pre>';
var_dump($array, $keys, $array2, $keys2);
echo '</pre>';
以上输出：

/var/www/test.php:
array (size=5)
  0 => 
    array (size=2)
      'one' => string 'aa' (length=2)
      'two' => string 'qq' (length=2)
  1 => 
    array (size=2)
      'one' => string 'bb' (length=2)
      'two' => string 'qq' (length=2)
  2 => 
    array (size=2)
      'one' => string 'aa' (length=2)
      'two' => string 'qq' (length=2)
  3 => 
    array (size=2)
      'one' => string 'bb' (length=2)
      'two' => string 'qq' (length=2)
  4 => 
    array (size=2)
      'one' => string 'aa' (length=2)
      'two' => string 'qq' (length=2)
/var/www/test.php:
array (size=3)
  0 => int 0
  1 => int 2
  2 => int 4
/var/www/test.php:27:
array (size=3)
  0 => 
    array (size=2)
      'one' => string 'aa' (length=2)
      'two' => string 'qq' (length=2)
  2 => 
    array (size=2)
      'one' => string 'aa' (length=2)
      'two' => string 'qq' (length=2)
  4 => 
    array (size=2)
      'one' => string 'aa' (length=2)
      'two' => string 'qq' (length=2)
/var/www/test.php:
array (size=3)
  0 => int 0
  1 => int 1
  2 => int 2

我正在尝试构建一个允许搜索多维数组的函数，其中每个子数组都匹配多个条件。我遇到一个奇怪的行为，无法弄清为什么...

Answer 1

<?php 

$array = [
    ['one' => 'aa', 'two' => 'qq'],
    ['one' => 'bb', 'two' => 'qq'],
    ['one' => 'aa', 'two' => 'qq'],
    ['one' => 'bb', 'two' => 'qq'],
    ['one' => 'aa', 'two' => 'qq'],
];

$keys = array_keys(array_column($array, 'one'), 'aa');
$array2 = array_filter($array, static function($key) use ($keys) {
    return in_array($key, $keys, true);
}, ARRAY_FILTER_USE_KEY);

$keys2 = array_keys(array_combine(array_keys($array2), array_column($array2, 'two')), 'qq', true);

echo '<pre>';
var_dump($array, $keys, $array2, $keys2);
echo '</pre>';