如何制作唯一的关联数组？

Question

我有一个这样填充的数组：

array_push($comboUserPosts, 
    array(
        'link'=> get_permalink(),
        'dates'=> $value,
        'title'=> get_the_title()
    )
);

然后当我完成所有循环时，我会这样做：

array_unique($comboUserPosts);

但它仍然给我重复。如果我这样做：

echo '<pre>' . var_export($comboUserPosts, true) . '</pre>';

这是我得到的：

array (
  0 => 
  array (
    'link' => 'https://example.com/test/test-values-users/',
    'dates' => '1920',
    'title' => 'test values users',
  ),
  1 => 
  array (
    'link' => 'https://example.com/test/test-values-users/',
    'dates' => ' 1954',
    'title' => 'test values users',
  ),
  2 => 
  array (
    'link' => 'https://example.com/test/provo-filter/',
    'dates' => '1600',
    'title' => 'provo filter',
  ),
  3 => 
  array (
    'link' => 'https://example.com/test/provo-filter/',
    'dates' => '1450',
    'title' => 'provo filter',
  ),
  4 => 
  array (
    'link' => 'https://example.com/test/provo-filter/',
    'dates' => '1330',
    'title' => 'provo filter',
  ),
)

但是通过查看，我只有 2 个唯一链接和标题，我应该只显示这两个链接+标题：

foreach ($comboUserPosts as $value) { ?>
    <h2><a href="<?php echo $value['link']; ?>"><?php echo $value['title']; ?></a>
<?php }

Answer 1

我能想到的最简单的方法是通过链接（使用array_column()）对数组进行索引，然后提取值...

$comboUserPosts = array_values(array_column($comboUserPosts, null, 'link'));
echo var_export($comboUserPosts, true);

上面的测试数据给出了...

array (
  0 => 
  array (
    'link' => 'https://example.com/test/test-values-users/',
    'dates' => ' 1954',
    'title' => 'test values users',
  ),
  1 => 
  array (
    'link' => 'https://example.com/test/provo-filter/',
    'dates' => '1330',
    'title' => 'provo filter',
  ),
)

Answer 2

您只需要先删除元素dates，然后使用array_unique

foreach($arr as $k=> &$v){
  unset($v['dates']);
}
print_r(array_unique($arr, SORT_REGULAR));

Live Demo

Answer 3

你可以这样写代码

<?php 
$ar = array (
  0 => 
  array (
    'link' => 'https://example.com/test/test-values-users/',
    'dates' => '1920',
    'title' => 'test values users',
  ),
  1 => 
  array (
    'link' => 'https://example.com/test/test-values-users/',
    'dates' => ' 1954',
    'title' => 'test values users',
  ),
  2 => 
  array (
    'link' => 'https://example.com/test/provo-filter/',
    'dates' => '1600',
    'title' => 'provo filter',
  ),
  3 => 
  array (
    'link' => 'https://example.com/test/provo-filter/',
    'dates' => '1450',
    'title' => 'provo filter',
  ),
  4 => 
  array (
    'link' => 'https://example.com/test/provo-filter/',
    'dates' => '1330',
    'title' => 'provo filter',
  ),
);
function unique_multidimensional_array($array, $key) { 
            $temp_array = array(); 
            $i = 0; 
            $key_array = array(); 

            foreach($array as $val) { 
                if (!in_array($val[$key], $key_array)) { 
                    $key_array[$i] = $val[$key]; 
                    $temp_array[$i] = $val; 
                } 
                $i++; 
            } 
            return $temp_array; 
        } 
$unique = unique_multidimensional_array($ar, 'link');
echo "<pre>";
print_r($unique);

?>

Answer 4

你可以用这个方法

array_unique($associativeArray,SORT_REGULAR);

使用名称和年龄键定义关联数组 $associativeArray。

  $associativeArray[] = array("name" => "Yogesh Singh","no"=>4);
  $associativeArray[] = array("name" => "Sonarika Singh","no"=>4);