remove duplicates from array (array unic by key)

Question

Array
(
    [0] => Array
        (
            [file] => /var/websites/example.com/assets/images/200px/1419050406e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.         


        

Answer 1

// your array
$array = array(...);
// will be used to store md5 hashes
$md5 = array();
// walk through array
foreach ($array as $key => $arr) {
  // have we already seen this md5 hash?
  if (in_array($arr['md5'], $md5)){
    // remove element
    unset($array[$key]);
  }else {
    // keep element, but add it's md5
    $md5[] = $arr['md5'];
  }
}