PHP - 從多維數組某些數組複製到另一個新的陣列

Question

我有此數組：

Array ( 
[0] => Array ([0] => b [1] => d [2] => c [3] =>a [4] =>) 

[1] => Array ([0] => c [1] => a [2] => d [3] => [4] =>) 

[2] => Array ([0] => b [1] => d [2] => a [3] => [4] =>) 

[3] => Array ([0] => a [1] => d [2] => c [3] =>b [4] =>) 

) 

，並想知道我是否可以從複製所有內部陣列到另一個數組，其中第一個元素是「B」所以它看起來像。新陣列在創建時是否會重新編制索引？謝謝。

Array ( 
[0] => Array ([0] => b [1] => d [2] => c [3] =>a [4] =>) 

[1] => Array ([0] => b [1] => d [2] => a [3] => [4] =>) 

) 

Answer 1

UPDATE：在我的代碼有一個小錯誤。如果您仍然需要它，現在它已經修復並正在工作。

$firstArray = array (array ('b', 'd', 'c', 'a'), 
        array ('c', 'd', 'a', 'b'), 
        array ('b', 'd', 'a', 'c'), 
        array ('a', 'd', 'c', 'b')); 

$secondArray = array(); 

foreach($firstArray as $sub) { 

    if($sub[0] == 'b') { 

     $secondArray[] = $sub; 
    } 
} 

print_r($secondArray); 

輸出：

Array ([0] => Array ([0] => b [1] => d [2] => c [3] => a) 
     [1] => Array ([0] => b [1] => d [2] => a [3] => c)) 

Answer 2

function check($val) { 
    return ($val[0] == 'b'); 
} 
$secondArray = array_filter($firstArray, "check");