兩個二維數組的合并

合并前的數組a：

array (size=3)  0 =>     array (size=2)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=2)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)

合并前的數組b：

array (size=2)  0 =>     array (size=2)      'user_id' => string '113' (length=2)      'count' => string '1' (length=1)  1 =>     array (size=2)      'user_id' => string '109' (length=2)      'count' => string '8' (length=1)

合并後的數組（合并條件，a的id==b的user_id時合并）：

array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)      1 =>     array (size=3)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)      'count' => string '0' (length=1)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

回複內容：

合并前的數組a：

array (size=3)  0 =>     array (size=2)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=2)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)

合并前的數組b：

array (size=2)  0 =>     array (size=2)      'user_id' => string '113' (length=2)      'count' => string '1' (length=1)  1 =>     array (size=2)      'user_id' => string '109' (length=2)      'count' => string '8' (length=1)

合并後的數組（合并條件，a的id==b的user_id時合并）：

array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)      1 =>     array (size=3)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)      'count' => string '0' (length=1)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

array_merge_recursive() 函數與 array_merge() 函數 一樣，將一個或多個數組的元素的合并起來，一個數組中的值附加在前一個數組的後面。並返回作為結果的數組。
但是，與 array_merge() 不同的是，當有重複的鍵名時，值不會被覆蓋，而是將多個相同鍵名的值遞迴組成一個數組。（參見例子 1）

$a1=array("a"=>"Horse","b"=>"Dog");
$a2=array("c"=>"Cow","b"=>"Cat");
print_r(array_merge_recursive($a1,$a2));
?>
輸出：
Array (
[a] => Horse
[b] => Array ( [0] => Dog [1] => Cat )
[c] => Cow
)

$a = array(    array('id'=>'113','email'=>'yintx_1292342352@163.com'),     array('id'=>'111','email'=>'yintx_1293456456@163.com'),     array('id'=>'109','email'=>'yintx_129@99999.com')    );$b = array(    array('user_id'=>'113','count'=>'1'),     array('user_id'=>'109','count'=>'8')    );foreach($a as $ka=>$va){    foreach($b as $kb=>$vb){        if($va['id'] == $vb['user_id']){            $a[$ka]['count'] = $vb['count'];        }    }}var_dump($a);----------array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)  1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

array_merge_recursive($a, $b);

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