PHP除去無用嵌套數組

Question

我使用jQuery插件，它產生以下的數組：

array:4 [ 
    0 => array:1 [ 
    "page_id" => "1" 
    ] 
    1 => array:2 [ 
    "page_id" => "2" 
    "children" => array:1 [ 
     0 => array:2 [ 
     0 => array:2 [ 
      "page_id" => "10" 
      "children" => array:1 [ 
      0 => array:2 [ 
       0 => array:1 [ 
       "page_id" => "12" 
       ] 
       1 => array:1 [ 
       "page_id" => "13" 
       ] 
      ] 
      ] 
     ] 
     1 => array:1 [ 
      "page_id" => "11" 
     ] 
     ] 
    ] 
    ] 
    2 => array:1 [ 
    "page_id" => "4" 
    ] 
    3 => array:1 [ 
    "page_id" => "3" 
    ] 
] 

該數組是動態的，從而可以有更多的嵌套陣列。我需要清理一些數組。正如你可以在page_id => 2下看到的，有孩子。它包含一個無用的數組（0 => array：2）。

是否有可能刪除這個無用的數組？我真的需要它來重新產生我的菜單項目的位置......任何想法？

Answer 1

您可以使用遞歸算法：

function removeUselessArrays($array) { 
    $newArray = []; 

    foreach ($array as $key => $value) { 
     if (is_array($value)) { 
      if (array_keys($value) === [ 0 ]) { 
       $newArray[$key] = removeUselessArrays($value[0]); 
      } else { 
       $newArray[$key] = removeUselessArrays($value); 
      } 
     } else { 
      $newArray[$key] = $value; 
     } 
    } 

    return $newArray; 
} 

看到代碼工作here。

Answer 2

你可以做的是從一個循環內，像這樣：

ALGORITHM:

<?php 

    foreach($arr as $key=>$val){ 
     foreach($val as $index=>$item){ 
      if(is_array($item)){ 
       $children    = ["page_id"=>$item[0]["page_id"]]; 
       $children    = array_merge($children, $item[0][$index]); 
       $arr[$key][$index]  = $children; 
      } 
     } 
    } 

TEST

<?php 

    // LOOP THROUGH THE ARRAY CONTAINING UNWANTED ELEMENT(S) 
    foreach($arr as $key=>$val){ 
     foreach($val as $index=>$item){ 
      // CHECK IF ONE OF THE SUB-ELEMENTS IS AN ARRAY & HAS KEY: children 
      if(is_array($item)){ 
       // IF SO; GET THE CHILDREN ELEMENT OFF THAT ITEM 
       // AND STORE IT IN A VARIABLE... 
       $children    = $item[0][$index]; 
       // NOW SET THE SUB-ELEMENT TO THE $children 
       $children    = ["page_id"=>$item[0]["page_id"]]; 
       $children    = array_merge($children, $item[0][$index]); 
       $arr[$key][$index]  = $children; 
      } 
     } 
    } 

    // DUMP-OUT THE OUTPUT: 
    var_dump($arr); 

    // PRODUCES::: 
    array (size=4) 
     0 => 
     array (size=1) 
      'page_id' => string '1' (length=1) 
     1 => 
     array (size=2) 
      'page_id' => string '2' (length=1) 
      'children' => 
      array (size=3) 
       'page_id' => string '10' (length=1) 
       0 => 
       array (size=1) 
        'page_id' => string '12' (length=1) 
       1 => 
       array (size=1) 
        'page_id' => string '13' (length=1) 
     2 => 
     array (size=1) 
      'page_id' => string '4' (length=1) 
     3 => 
     array (size=1) 
      'page_id' => string '3' (length=1) 

快速測試發現Here。