php - How can I sort the results of a for each loop?

I have a list of stringsvar_dump($key):

string(6) "samuel"
string(4) "john"
string(4) "alan"
string(5) "frank"
string(3) "bob"
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They are a result of a loop from a multidimensional array:

foreach ($array as $key => $item) { 
   if(is_array($item)){
      if (stripos($key, $keySearch) !== false){
      var_dump($key);
      }
   }
}
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Is it possible to sort this list of strings?

I tried:

   foreach ($array as $key => $item) {  
       if(is_array($item)){
          if (stripos($key, $keySearch) !== false){
          asort($key);
          var_dump($key);
          }
       }
    }
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and also

foreach ($array as $key => $item) {  
       if(is_array($item)){
          if (stripos($key, $keySearch) !== false){
              array_multisort($key);
              var_dump($key);
          }
       }
    }
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My sort attemts are not working. The problem is I cannot sort thearray because it is a complex multidimensional array. So I somehow only want to sort the results. But I am not sure how to do that.

The result I wish forvar_dump($key) would be:

string(4) "alan"
string(3) "bob"
string(5) "frank"
string(4) "john"
string(6) "samuel"
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