PHP合并2个数字键数组的值的程序

$a = array('a', 'b');
$b = array('c', 'd');
$c = $a + $b;
var_dump($a);
var_dump(array_merge($a, $b));

//输出：

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  2 => string 'c' (length=1)
  3 => string 'd' (length=1)

++++++++++++++++++++++++++++++++++++++++++ 
 
$a = array(
 0 => 'a',
 1 => 'b'
);
$b = array(
 0 => 'c',
 1 => 'b'
);
$c = $a + $b;
var_dump($c);
var_dump(array_merge($a, $b));

//输出：

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  2 => string 'c' (length=1)
  3 => string 'b' (length=1)

++++++++++++++++++++++++++++++++++++++++++ 

$a = array('a', 'b');
$b = array(
 '0' => 'c',
 1 => 'b'
);
$c = $a + $b;
var_dump($c);
var_dump(array_merge($a, $b));

//输出：
array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  2 => string 'c' (length=1)
  3 => string 'b' (length=1)

++++++++++++++++++++++++++++++++++++++++++

$a = array(
 0 => 'a',
 1 => 'b'
);
$b = array(
 '0' => 'c',
 '1' => 'b'
);
$c = $a + $b;
var_dump($c);
var_dump(array_merge($a, $b));

输出：

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  2 => string 'c' (length=1)
  3 => string 'b' (length=1)

/**
 * PHP合并2个数字键数组的值
 *
 * @param array $arr1
 * @param array $arr2
 * @return array
 * @author www.111com.net
 */
function new_array_merge($arr1, $arr2)
{
 $arr = array_flip($arr1) + array_flip($arr2);
 return array_keys($arr);
}

$arr1 = array('aa', 'bb', 'cc');
$arr2 = array('aa2', 'bb', 'cc2');

$arr = new_array_merge($arr1, $arr2);
print_r($arr);

输出：

Array
(
    [0] => aa
    [1] => bb
    [2] => cc
    [3] => aa2
    [4] => cc2
)