我正在尝试将多维数组的键从camelCase或StudlyCase/PascalCase转换为snake_case，但更复杂的是，某些键有一个前导感叹号，我想将其删除。
例如：
$array = array(
'!AccountNumber' => '00000000',
'Address' => array(
'!Line1' => '10 High Street',
'!line2' => 'London'));
我想转换为：
$array = array(
'account_number' => '00000000',
'address' => array(
'line1' => '10 High Street',
'line2' => 'London'));
我的现实生活中的数组非常巨大并且深入很多层次。
这是我使用的修改后的功能，摘自soulmerge的回复：
function transformKeys(&$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;
}
这是亚伦的更通用的版本。这样你就可以为所有按键插入你想要操作的功能。我假设了一个静态类。
public static function toCamelCase ($string) {
$string_ = str_replace(' ', '', ucwords(str_replace('_',' ', $string)));
return lcfirst($string_);
}
public static function toUnderscore ($string) {
return strtolower(preg_replace('/([^A-Z])([A-Z])/', "$1_$2", $string));
}
// http://stackoverflow.com/a/1444929/632495
function transformKeys($transform, &$array) {
foreach (array_keys($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
$transformedKey = call_user_func($transform, $key);
# Work recursively
if (is_array($value)) self::transformKeys($transform, $value);
# Store with new key
$array[$transformedKey] = $value;
# Do not forget to unset references!
unset($value);
endforeach;
}
public static function keysToCamelCase ($array) {
self::transformKeys(['self', 'toCamelCase'], $array);
return $array;
}
public static function keysToUnderscore ($array) {
self::transformKeys(['self', 'toUnderscore'], $array);
return $array;
}
您可以在数组键上运行 foreach，这样您就可以就地重命名键：
function transformKeys(&$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]);
}
}
}
虽然这可能不是问题的准确答案，但我想将其发布在这里，供那些正在寻找优雅的解决方案来更改多维 PHP 数组中的关键案例的人们使用。您还可以调整它以更改一般的数组键。只需调用不同的函数而不是 array_change_key_case_recursive
// converts all keys in a multidimensional array to lower or upper case
function array_change_key_case_recursive($arr, $case=CASE_LOWER)
{
return array_map(function($item)use($case){
if(is_array($item))
$item = array_change_key_case_recursive($item, $case);
return $item;
},array_change_key_case($arr, $case));
}
创建一个如下函数：
function convertToCamelCase($array){
$finalArray = array();
foreach ($array as $key=>$value):
if(strpos($key, "_"))
$key = lcfirst(str_replace("_", "", ucwords($key, "_"))); //let's convert key into camelCase
if(!is_array($value))
$finalArray[$key] = $value;
else
$finalArray[$key] = $this->_convertToCamelCase($value );
endforeach;
return $finalArray;
}
并这样称呼它：
$newArray = convertToCamelCase($array);
工作示例请参阅此
<?php
class Maison {
public $superficieAll_1;
public $addressBook;
}
class Address {
public $latitudeAmi;
public $longitude;
}
$maison = new Maison();
$maison->superficieAll_1 = 80;
$maison->addressBook->longitudeAmi = 2;
$maison->addressBook->latitude = 4;
$returnedArray = transformation($maison);
print_r($returnedArray);
function transformation($obj){
//object to array
$array = json_decode(json_encode((array) $obj),true);
//now transform all array keys
return transformKeys($array);
}
function transformKeys($array)
{
foreach ($array as $key => $value){
// echo "$key <br>";
unset($array[$key]);
$transformedKey = strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', ltrim($key, '!')));
$array[$transformedKey] = $value;
// echo "$transformedKey update <br>";
if (is_array($value)) {
$array[$transformedKey] = transformKeys($value);
}
}
return $array;
}
我想说你必须编写一个函数来复制数组（一级），并且如果任何值是数组（递归函数），则让该函数调用自身。
您到底需要什么具体帮助？
为了避免改变原始数组并返回具有重新格式化键的新数组，请使用递归函数而不通过引用进行修改，并在每个级别返回新数组。
代码：（演示）
function snakeCaseKeys($array): array
{
$result = [];
foreach ($array as $k => $v) {
$k = strtolower(
preg_replace(
'/[a-z]\K(?=[A-Z])/',
'_',
ltrim($k, '!')
)
);
$result[$k] = is_array($v) ? snakeCaseKeys($v) : $v;
}
return $result;
}
var_export(
snakeCaseKeys($array)
);
测试数据：
$array = [
'!AccountNumber' => '00000000',
'Address' => [
'!Line1' => '10 High Street',
'deeperSubArrayToRekey' => [
'camelCase' => 'starts with lowercase',
'PascalCase' => 'starts with uppercase',
'StudlyCase' => 'is a synonym for PascalCase',
'!!!!snake_case' => 'is already fully lowercase',
],
'!line2' => 'London',
'Line1' => 'will overwrite 10 High Street',
]
];
输出：
array (
'account_number' => '00000000',
'address' =>
array (
'line1' => 'will overwrite 10 High Street',
'deeper_sub_array_to_rekey' =>
array (
'camel_case' => 'starts with lowercase',
'pascal_case' => 'starts with uppercase',
'studly_case' => 'is a synonym for PascalCase',
'snake_case' => 'is already fully lowercase',
),
'line2' => 'London',
),
)