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Possible Duplicate:
Comparing elements in a multidimensional array

My array look like 

Array
(
    [0] => Array
        (
            [event_key] => 1
            [event_id] => 5
            [event_desc] => Test Event 1
        )

    [1] => Array
        (
            [event_key] => 2
            [event_id] => 2
            [event_desc] => Test Event 2
        )

    [2] => Array
        (
            [event_key] => 3
            [event_id] => 5
            [event_desc] => Test Event 3
        )

    [3] => Array
        (
            [event_key] => 4
            [event_id] => 4
            [event_desc] => Test Event 4

        )

    [4] => Array
        (
            [event_key] => 5
            [event_id] => 5
            [event_desc] => Test Event 5

        )

)

I want to remove a sub array if event_id is duplicate

So Desired result is 

Array
(
    [0] => Array
        (
            [event_key] => 1
            [event_id] => 5
            [event_desc] => Test Event 1
        )

    [1] => Array
        (
            [event_key] => 2
            [event_id] => 2
            [event_desc] => Test Event 2
        )

    [2] => Array
        (
            [event_key] => 4
            [event_id] => 4
            [event_desc] => Test Event 4

        )


)
Community
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GajendraSinghParihar
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    Aah, there are so many effing duplicates of this! One line hint answer: `foreach ($array as $val) { $deDuplicated[$val['event_id']] = $val; }`. Voila! – deceze Aug 31 '12 at 10:59
  • its very simple but for that your PHP for handling array should be clear – Arpit Srivastava Aug 31 '12 at 11:00

1 Answers1

1

Something like this shall do the trick:

$knownIds = array();
foreach( $myArray AS $key=>$item ) {
  if( array_key_exists($item['event_id'], $knownIds) === true ) {
    unset( $myArray[$key] );
  } else {
    $knownIds[$item['event_id']] = $key;  // value does not matter really here
  }
}
$myArray = array_values($myArray);

where $myArray is your source array.

Marcin Orlowski
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