如果某個鍵的值重複，則刪除子數組

Question

如果爲特定鍵找到重複值，我想從多維數組中刪除一個子數組。 answer(s) here根本沒有工作。但是，answer here適用於大量數組，但速度會變慢。尋找更清潔，更快速的解決方案。

例PHP陣列

$args = array(); 

    $args[] = array(
     'section' => array(
      'id' => 'section1', 
      'name' => 'Section 1', 
     ), 
     'name' => 'Shortcode Name', 
     'action' => 'shortcodeaction', 
     'icon' => 'codeicon', 
     'image' => 'codeimage', 
    ); 
    $args[] = array(
     'section' => array(
      'id' => 'section2', 
      'name' => 'Section 2', 
     ), 
     'name' => 'Shortcode2 Name', 
     'action' => 'shortcodeaction2', 
     'icon' => 'codeicon2', 
     'image' => 'codeimage2', 
    ); 
    $args[] = array(
     'section' => array(
      'id' => 'section3', 
      'name' => 'Section 3', 
     ), 
     'name' => 'Shortcode3 Name', 
     'action' => 'shortcodeaction3', 
     'icon' => 'codeicon3', 
     'image' => 'codeimage3', 
    ); 
    $args[] = array(
     'section' => array(
      'id' => 'section1', 
      'name' => 'Section 4', 
     ), 
     'name' => 'Shortcode4 Name', 
     'action' => 'shortcodeaction4', 
     'icon' => 'codeicon4', 
     'image' => 'codeimage4', 
    ); 
    $args[] = array(
     'section' => array(
      'id' => 'section5', 
      'name' => 'Section 5', 
     ), 
     'name' => 'Shortcode5 Name', 
     'action' => 'shortcodeaction5', 
     'icon' => 'codeicon5', 
     'image' => 'codeimage5', 
    ); 

    $sections = array(); 

    foreach ($args as $arg) { 
     $sections[] = $arg['section']; 
    } 

並且，print_r($sections)結果。

Array 
(
    [0] => Array 
     (
      [id] => section1 
      [name] => Section 1 
     ) 

    [1] => Array 
     (
      [id] => section2 
      [name] => Section 2 
     ) 

    [2] => Array 
     (
      [id] => section3 
      [name] => Section 3 
     ) 

    [3] => Array 
     (
      [id] => section1 
      [name] => Section 4 
     ) 

    [4] => Array 
     (
      [id] => section5 
      [name] => Section 5 
     ) 

) 

兩個Array[0]和Array[3]具有用於鍵id相同的值，爲此整個Array[3]在我的情況下，以避免重複去除。

雖然這對我有用，但是當數組爲100或更多時，它會變得非常慢。

$knownIds = array(); 
    foreach($sections AS $key=>$item) { 
     if(array_key_exists($item['id'], $knownIds) === true) { 
     unset($sections[$key]); 
     } else { 
     $knownIds[$item['id']] = $key; 
     } 
    } 
    $sections = array_values($sections); 

試了幾個答案在這裏StackOverflow上（包括this），但沒有人幫助我的情況。

感謝

Answer 1

可以使用array_column和array_filter修改全 -

//get all the sections value 
$section = array_column($args, 'section'); 

//store ids in temp array 
$idArray = array_unique(array_column($section, 'id')); 
//filter the array having unique id 
$uniqueSections = array_filter($section, function ($key, $value) use ($idArray) { 
    return in_array($value, array_keys($idArray)); 
}, ARRAY_FILTER_USE_BOTH); 

var_dump($uniqueSections); 

對於PHP < 5.5

$section = array_map(function($args) { 
      return $args['section']; 
      }, $args); 

$idArray = array_unique(array_map(function($section){return $section['id'];}, $section));