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Comparing PHP and 2 multidimensional arrays based on two key values

I have two multidimensional arrays:

$original = Array (
[0] => Array
    (
        [time] => 1364690340
        [memberid] => 90
        [type] => single
    )

[1] => Array
    (
        [time] => 1364690341
        [memberid] => 92
        [type] => fixed
    )

[2] => Array
    (
        [time] => 1364690342
        [memberid] => 96
        [type] => single
    )
)

and a second one like this

$new = Array (
[0] => Array
    (
        [time] => 1364825750
        [memberid] => 90
        [type] => single
    )

[1] => Array
    (
        [time] => 1364825751
        [memberid] => 92
        [type] => single
    )

[2] => Array
    (
        [time] => 1364825752
        [memberid] => 96
        [type] => single
    )

[3] => Array
    (
        [time] => 1364825753
        [memberid] => 111
        [type] => single
    )
)

My problem: I want to search for the $ original array for matches based on memberid and type keys, and if memberid and type ARE NOT are the same → I want to remove this array from $ original array. Therefore, in this case, I want to save [0] Array and [2] Array, as in $ new array. I have the same member and the same type as in the original, but I would like to remove [1] Array, since memberid is the same, but the type is different. So my last source array would look like this:

$original = Array (
[0] => Array
    (
        [time] => 1364690340
        [memberid] => 90
        [type] => single
    )

[1] => Array
    (
        [time] => 1364690342
        [memberid] => 96
        [type] => single
    )
)
+5
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2 answers

Here you go, just tested it, and it works as expected.

// Presuming your two arrays are still called $new & $original
$original = array(); // your data
$new = array(); // your data

$newArray = array();
foreach($original AS $key => $val){
    $newArray[$val['memberid'] . '-' . $val['type']] = $val;
}

$original = array();
foreach($new AS $key => $val){
    if(isset($newArray[$val['memberid'] . '-' . $val['type']])){
        $original[] = $newArray[$val['memberid'] . '-' . $val['type']];
    }
}

print_r($original);
+2
source

- O (m * n), m n - :

$new_original = array();
foreach ($original as $elem) {
  // let see if $new has something with the same type and memberid
  foreach ($new as $candidate) {
    if ($candidate['type'] == $elem['type'] &&
        $candidate['memberid'] == $elem['memberid']) {
      // it does! let keep $elem
      $new_original[] = $elem;
    }
  }
}

// reassign it to $original if desired
$original = $new_original;

, . , , $new:

// turn $new into a map
$new_as_map = array();
foreach ($new as $candidate) {
  $new_as_map[$candidate['memberid']] = $candidate;
}

$new_original = array();
foreach ($original as $elem) {
  if (isset($new_as_map[$elem['memberid']])) {
    $candidate = $new_as_map[$elem['memberid']];
    if ($candidate['type'] == $elem['type']) {
      $new_original[] = $elem;
    }
  }
}

// reassign it to $original if desired
$original = $new_original;
-1

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