/**
* 递归合并两个或多个数组
* 本函数内使用for语句，以及func_get_arg函数，实现多个数组递归合并
* $john = array('name' => 'john', 'children' => array('fred', 'paul', 'sally', 'jane'));
* $mary = array('name' => 'mary', 'children' => array('jane'));
*
* $john = Helper_Array::merge($john, $mary);
*
* array('name' => 'mary', 'children' => array('fred', 'paul', 'sally', 'jane'))
*
* @param a1 原始数组
* @param a2 需要合并的数组
* @return array
*/
public static function merge(array $a1, array $a2)
{
$result = array();
for ($i = 0, $total = func_num_args(); $i < $total; $i++) {
$arr = func_get_arg($i);
$assoc = Helper_Array::isAssoc($arr);
foreach ($arr as $key => $val) {
if (isset($result[$key])) {
if (is_array($val) && is_array($result[$key])) {
if (Helper_Array::isAssoc($val)) {
$result[$key] = Helper_Array::merge($result[$key], $val);
} else {
$diff = array_diff($val, $result[$key]);
$result[$key] = array_merge($result[$key], $diff);
}
} else {
if ($assoc) {
$result[$key] = $val;
} elseif (!in_array($val, $result, true)) {
$result[] = $val;
}
}
} else {
$result[$key] = $val;
}
}
}
return $result;
}
