非法失調誤差

Question

我有一個數組，看起來像這樣，那我通過循環： 數組的名稱爲$測試

Array 
(
[ven1] => Array 
    (
     [0] => Array 
      (
       [0] => ven1-center1 
       [1] => ven1 
       [2] => Address 
      ) 

     [1] => Array 
      (
       [0] => ven1-center2 
       [1] => ven1 
       [2] => Address 
      ) 

     [2] => Array 
      (
       [0] => ven1-center3 
       [1] => ven1 
       [2] => Address 
      ) 

      . 
      . 
      . 


[ven2] => Array 
    (
     [20] => Array 
      (
       [0] => ven2-center1 
       [1] => ven2 
       [2] => Address 
      ) 

     [21] => Array 
      (
       [0] => ven2-center2 
       [1] => ven2 
       [2] => Address 
      ) 

     [22] => Array 
      (
       [0] => ven2-center3 
       [1] => ven2 
       [2] => Address 
      ) 

下面我有循環整個數組的PHP代碼，從最內層獲取[0]的所有值，並將它們存儲到名爲$ k的數組中。 當我運行下面的代碼時，我得到Notice: Undefined offset:所有$ c的值。

for($c = 0; $c < 42; $c++){ 
     foreach($test as $k => $v){ 
      if($test[$k][$c][1] == $k){ 
      $k = $test[$k][$c][0]; 
     } 
     } 
    } 

輸出在找的是

$ven1 = array("ven1-center1","ven1-center2","ven1-center3","ven1-center4") 
$ven2 = array("ven1-center1","ven1-center2","ven1-center3","ven1-center4") 

Answer 1

我認爲這會做你想要什麼......假設我正確地解釋你的問題：

foreach($test as $varname => $array){ 
    foreach($array as $row) { 
     if ($row[1] == $varname) ${$varname}[] = $row[0]; 
    } 
} 

var_dump($ven1); 
var_dump($ven2);