php array_merge_recursive正在用数字键替换一些键字符串

Question

我在使用php功能array_merge_recursive时遇到了意外的行为。任何建议或解决方法，将不胜感激。

问题是在array_merge_recursive期间意外用数字键替换了字符串键。

详细信息：

我有三个关联数组（$birthdays,$custom,$natHolidays），这些值以编程方式添加到其中：

$birthdays['0808'][] = 'John MacLoud';
$birthdays['0819'][] = 'Susan MacLoud';
$birthdays['0903'][] = 'Catherine MacLoud';
$birthdays['1008'][] = 'Daisy Simpson';
$birthdays['1015'][] = 'Phillip MacLoud';
$birthdays['1212'][] = 'Aloysius Simpson';
$natHolidays['0317'][] = 'St. Patrick's Day';
$natHolidays['0317'][] = 'la Saint-Patrick';
$natHolidays['0701'][] = 'Canada Day';
$natHolidays['0701'][] = 'la fête du Canada';
$natHolidays['1031'][] = 'Hallowe'en';
$natHolidays['1031'][] = 'l'Halloween';
$natHolidays['1031'][] = 'Hallowe'en';
$natHolidays['1031'][] = 'l'Halloween';
$natHolidays['1111'][] = 'Remembrance Day';
$natHolidays['1111'][] = 'jour du souvenir';
$natHolidays['1224'][] = 'Christmas Eve';
$natHolidays['1224'][] = 'la vielle de Noël';
$natHolidays['1225'][] = 'Christmas';
$natHolidays['1225'][] = 'Noël';
$natHolidays['1226'][] = 'Boxing Day';
$natHolidays['1226'][] = 'le lendemain de Noël';
$natHolidays['1231'][] = 'New Year's Eve';
$natHolidays['1231'][] = 'vielle du jour de 'an';
$natHolidays['0907'][] = 'Labour Day';
$natHolidays['0907'][] = 'la fête du Travail';
$natHolidays['0922'][] = 'Equinox';
$natHolidays['0922'][] = 'l'equinoxe';
$natHolidays['1012'][] = 'Thanksgiving';
$natHolidays['1012'][] = 'l'action de grace';
$natHolidays['1101'][] = 'Daylight Savings ends';
$natHolidays['1101'][] = 'fall back';
$natHolidays['1221'][] = 'Solstice';
$natHolidays['1221'][] = 'le solstice';
$custom['0922'][] = 'Test value 1';
$custom['1122'][] = 'Test value 2';

然后合并数组：$dates = array_merge_recursive($birthdays,$custom,$natHolidays);

结果$dates数组输出：

["0808"]=>
  array(1) {
    [0]=>
    string(13) "John MacLoud"
  }
  ["0819"]=>
  array(1) {
    [0]=>
    string(13) "Susan MacLoud"
  }
  ["0903"]=>
  array(1) {
    [0]=>
    string(14) "Catherine MacLoud"
  }
  [0]=>
  array(1) {
    [0]=>
    string(15) "Daisy Simpson"
  }
  [1]=>
  array(1) {
    [0]=>
    string(14) "Phillip MacLoud"
  }
  [2]=>
  array(1) {
    [0]=>
    string(13) "Aloysius Simpson"
  }
  ["0317"]=>
  array(2) {
    [0]=>
    string(22) "St. Patrick's Day"
    [1]=>
    string(16) "la Saint-Patrick"
  }
  ["0701"]=>
  array(2) {
    [0]=>
    string(10) "Canada Day"
    [1]=>
    string(18) "la fête du Canada"
  }
  [3]=>
  array(2) {
    [0]=>
    string(15) "Hallowe'en"
    [1]=>
    string(16) "l'Halloween"
  }
  [4]=>
  array(2) {
    [0]=>
    string(15) "Remembrance Day"
    [1]=>
    string(16) "jour du souvenir"
  }
  [5]=>
  array(2) {
    [0]=>
    string(13) "Christmas Eve"
    [1]=>
    string(18) "la vielle de Noël"
  }
  [6]=>
  array(2) {
    [0]=>
    string(9) "Christmas"
    [1]=>
    string(5) "Noël"
  }
  [7]=>
  array(2) {
    [0]=>
    string(10) "Boxing Day"
    [1]=>
    string(21) "le lendemain de Noël"
  }
  [8]=>
  array(2) {
    [0]=>
    string(19) "New Year's Eve"
    [1]=>
    string(26) "vielle du jour de 'an"
  }
  ["0907"]=>
  array(2) {
    [0]=>
    string(10) "Labour Day"
    [1]=>
    string(19) "la fête du Travail"
  }
  ["0922"]=>
  array(3) {
    [0]=>
    string(14) "Test value 1"
    [1]=>
    string(7) "Equinox"
    [2]=>
    string(15) "l'equinoxe"
  }
  [9]=>
  array(1) {
    [0]=>
    string(15) "Test value 2"
  }
  [10]=>
  array(2) {
    [0]=>
    string(12) "Thanksgiving"
    [1]=>
    string(22) "l'action de grace"
  }
  [11]=>
  array(2) {
    [0]=>
    string(21) "Daylight Savings ends"
    [1]=>
    string(9) "fall back"
  }
  [12]=>
  array(2) {
    [0]=>
    string(8) "Solstice"
    [1]=>
    string(11) "le solstice"
  }

我注意到的唯一模式是，任何以'0'开头的键串（即0130）都能按预期工作，而任何以'1'开头的键串（即1022）< [用顺序数字键替换字符串键。

想法？

Btw：

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Answer 1

PHP是松散类型的，它正在转换您的数组键。

您可以使用整数作为键来避免强制转换：

$arr[10] = 'foo';

而不是
$arr["10"] = 'foo';

更新后的答案：
强制转换将以“ 0”开头的键视为字符串，到目前为止效果很好。其他键被视为整数，array_merge将它们从0开始renumber（因为它在这里发生）。
我知道您正在使用array_merge_recursive，但它的行为似乎相同。