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Filter array to have only unique values

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Filter array to have only unique values

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  1. function arrayUnique($array, $preserveKeys = false)  
  2. {  
  3.     // Unique Array for return  
  4.     $arrayRewrite = array();  
  5.     // Array with the md5 hashes  
  6.     $arrayHashes = array();  
  7.     foreach($array as $key => $item) {  
  8.         // Serialize the current element and create a md5 hash  
  9.         $hash = md5(serialize($item));  
  10.         // If the md5 didn't come up yet, add the element to  
  11.         // to arrayRewrite, otherwise drop it  
  12.         if (!isset($arrayHashes[$hash])) {  
  13.             // Save the current element hash  
  14.             $arrayHashes[$hash] = $hash;  
  15.             // Add element to the unique Array  
  16.             if ($preserveKeys) {  
  17.                 $arrayRewrite[$key] = $item;  
  18.             } else {  
  19.                 $arrayRewrite[] = $item;  
  20.             }  
  21.         }  
  22.     }  
  23.     return $arrayRewrite;  
  24. }

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