我正在尝试合并这两个数组

$arr1 = array('a' => "1", 'b' => "2", 'c' => "3");
$arr2 = array('a' => "9", 'b' => "8", 'd' => "7");

变成看起来像这样的数组

$arr1 = array(  
   'a' => array("1", "9"),  
   'b' => array("2", "8"),  
   'c' => array("3", ""),
   'd' => array("", "7")
);

棘手的部分是空白.我需要将它们保留在原位.

谢谢

解决方法:

这是我的建议.根据您的描述,它将组合任意数量的数组.

error_reporting(E_ALL | E_STRICT);
header('Content-Type: text/plain');

$arr1 = array('a' => "1", 'b' => "2", 'c' => "3");
$arr2 = array('a' => "9", 'b' => "8", 'd' => "7");
$arr = combine($arr1, $arr2);
print_r($arr);

function combine() {
  $keys = array();
  foreach (func_get_args() as $arr) {
    if (is_array($arr)) {
      $keys += $arr;
    }
  }
  $keys = array_keys($keys);
  $values = array_pad(array(), count($keys), array());
  $ret = array_combine($keys, $values);
  foreach (func_get_args() as $arr) {
    foreach ($keys as $k) {
      $v = array_key_exists($k, $arr) ? $arr[$k] : '';
      array_push($ret[$k], $v);
    }
  }
  return $ret;
}

输出：

Array
(
    [a] => Array
        (
            [0] => 1
            [1] => 9
        )

    [b] => Array
        (
            [0] => 2
            [1] => 8
        )

    [c] => Array
        (
            [0] => 3
            [1] => 
        )

    [d] => Array
        (
            [0] => 
            [1] => 7
        )

)