如何对包含字符串的数组进行分组？ [关闭]

Question

I have an array which contains strings and I need to group them accordingly. Please advise.

Array ( 
  [0] => string1 
  [1] => string1 
  [2] => string2 
  [3] => string2 
  [4] => string3 
  [5] => string1  
      ) 

I need the output as follows:

string1
string2
string3

How can I achieve this?

Answer 1

<?php
$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);
print_r($result);
?>

From:http://in3.php.net/array_unique