Как преобразовать все ключи в массиве multi-dimenional в snake_case?

Question

Как преобразовать все ключи в массиве multi-dimenional в snake_case?

Как насчет

List<object> collection = new List<object>((IEnumerable)myObject);

9

php arrays multidimensional-array

задан aaronrussell 18 September 2009 в 13:14

3 ответа

I'd say you would have to write a function to copy the array (one level) and have that function call itself if any of the values is an array (a recursive function).

The exclamation marks are easily removed using trim()
The underscore before the uppercase characters in the middle can be added using a regex
After adding the underscore, the whole key can be converted to lower case

What exactly do you need any specific help with?

0

ответ дан 4 December 2019 в 11:06

You can run a foreach on the arrays keys, this way you'll rename the keys in-place:

function transformKeys(&$array) {
    foreach (array_keys($array) as $key) {
        # This is what you actually want to do with your keys:
        #  - remove exclamation marks at the front
        #  - camelCase to snake_case
        $transformedKey = ltrim($key, '!');
        $transformedKey = strtolower($transformedKey[0] . preg_replace('/[A-Z]/', '_$0', substr($transformedKey, 1)));
        # Store with new key
        $array[$transformedKey] = &$array[$key];
        unset($array[$key]);
        # Work recursively
        if (is_array($array[$transformedKey])) {
            transformKeys($array[$transformedKey]);
        }
    }
}

1

ответ дан 4 December 2019 в 11:06

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score 11 · Accepted Answer

Это модифицированная функция, которую я использовал, взято из ответа soulmerge:

function transformKeys(&$array)
{
  foreach (array_keys($array) as $key):
    # Working with references here to avoid copying the value,
    # since you said your data is quite large.
    $value = &$array[$key];
    unset($array[$key]);
    # This is what you actually want to do with your keys:
    #  - remove exclamation marks at the front
    #  - camelCase to snake_case
    $transformedKey = strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', ltrim($key, '!')));
    # Work recursively
    if (is_array($value)) transformKeys($value);
    # Store with new key
    $array[$transformedKey] = $value;      
    # Do not forget to unset references!
    unset($value);
  endforeach;
}