Php 仅从数组中选择不同的值

这里，我有以下变量$countries\u all：

Array ( 
  [0] => stdClass Object 
      ( 
          [countries] => India,Afghanestan,Japan,South Africa
      ) 
  [1] => stdClass Object 
      ( 
          [countries] => Singapore,South Africa,India,Pakistan
      )
  [2] => stdClass Object 
      ( 
          [countries] => Japan,Australia,India
      ) 
)

但我需要创建仅包含唯一值的第二个数组$countries：

Array ( 
  [0] => stdClass Object 
      ( 
          [countries] => India
      )
  [1] => stdClass Object 
      ( 
          [countries] => Afghanestan
      )
  [2] => stdClass Object 
      ( 
          [countries] => Japan
      )
  [3] => stdClass Object 
      ( 
          [countries] => South Africa
      )
  [4] => stdClass Object 
      ( 
          [countries] => Singapore
      )
  [5] => stdClass Object 
      ( 
          [countries] => Pakistan
      )
  [6] => stdClass Object 
      ( 
          [countries] => Japan
      )
  [7] => stdClass Object 
      ( 
          [countries] => Australia
      ) 
)

对于按（，）拆分，我使用了以下方法

foreach ($countries_all as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $uni_countries){
        echo $uni_countries;
    }
}

但是如何从上面的例子中得到唯一的值

有人能帮我吗

提前谢谢

EDIT1

这里我还有一个与上述问题相关的问题

现在我得到了唯一的值

如何从数据库中获取唯一值的结果

比如说,， 我希望所有的结果（比如）都是“印度”

试试这个：

$newlist = array();
foreach ($countries_list as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $uni_countries){
        echo $uni_countries;
        $newlist[] = $uni_countries){
    }
}
array_unique($newlist);

$uniqueCountries = array();

foreach ($countries_list as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $country){
        if (!in_array($country, $uniqueCountries)) {
            //adding to list
            $uniqueCountries[] = $country
        } else {
             echo $country, ' already in list', PHP_EOL;
        }
    }
}

$uniqueCoutries包含所有找到的coutries，没有重复项

请尝试以下操作：

$uniqueCountries = array();

foreach ($countries_list as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $country){
        if (!in_array($country, $uniqueCountries)) {
            //adding to list
            $uniqueCountries[] = $country
        } else {
             echo $country, ' already in list', PHP_EOL;
        }
    }
}

$uniqueCoutries包含所有找到的coutries，没有重复项

该函数正是您要查找的函数

$countries = array();
foreach ($countries_all as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $country){
        $countries[] = $country;
    }
}
$countries = array_unique($countries);

这个函数就是你要找的

$countries = array();
foreach ($countries_all as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $country){
        $countries[] = $country;
    }
}
$countries = array_unique($countries);

你可以试试这个

$countrieslist = array();
foreach ($countries_all as $list){
    $countrieslist[] = explode(',', $list->countries);
}
$array = array_unique(array_reduce($countrieslist,'array_merge', array()));

你可以试试这个

$countrieslist = array();
foreach ($countries_all as $list){
    $countrieslist[] = explode(',', $list->countries);
}
$array = array_unique(array_reduce($countrieslist,'array_merge', array()));

---

您从哪里获得$countries？那应该是$uni_国家吗？哈，对不起，只有$uni_国家。你从哪里得到$uni_国家？这应该是$uni_国家吗？哈，对不起，这只是$uni_国家