如何匹配/配对两个数组元素并在 PHP 中只返回一个

Question

Is it possible to match all email_adr and ad_owner_email and keep one? For example [0] and [1] is a match and [0] or [1] gets deleted in the filtered array. It's ok to get "cross matched" through all ["email_adr"] and ["ad_owner_email"] elements.

 array(3) {
      [0]=>
      array(3) {
        ["id"]=>
        string(5) "14598"
        ["email_adr"]=>
        string(14) "jos@pl.nuu"
        ["ad_owner_email"]=>
        string(23) "boo@gmail.qom"
      }
      [1]=>
      array(3) {
        ["id"]=>
        string(5) "14598"
        ["email_adr"]=>
        string(23) "boo@gmail.qom"
        ["ad_owner_email"]=>
        string(14) "jos@pl.nuu"
      }
      [2]=>
      array(3) {
        ["id"]=>
        string(5) "14598"
        ["email_adr"]=>
        string(23) "boo@gmail.qom"
        ["ad_owner_email"]=>
        string(21) "pelle@med.nuu"
      }
    }

Desired result:

 array(2) {
          [0]=>
          array(3) {
            ["id"]=>
            string(5) "14598"
            ["email_adr"]=>
            string(23) "boo@gmail.qom"
            ["ad_owner_email"]=>
            string(14) "jos@pl.nuu"
          }
          [1]=>
          array(3) {
            ["id"]=>
            string(5) "14598"
            ["email_adr"]=>
            string(23) "boo@gmail.qom"
            ["ad_owner_email"]=>
            string(21) "pelle@med.nuu"
          }
        }

Answer 1

This might help you on your way. Taking the original array, $arr we loop through all elements and compare email_adr to ad_owner_email , as follows:

foreach($arr as $key => $value) {
    if(isset($arr[$key+1])) {
        if ($value['email_adr'] == $arr[$key + 1]['ad_owner_email']) {
            unset($arr[$key]);
        }
    }
}

working demo

Answer 2

At the first step you can collect all possible email pairs into $tmp array:

foreach($array as $record){
    $tmp1[$record['email_adr']][] = $record['ad_owner_email']; 
}

This will create array like:

Array
(
    [jos@pl.nuu] => Array
        (
            [0] => boo@gmail.qom
        )

    [boo@gmail.qom] => Array
        (
            [0] => pelle@med.nuu
            [1] => jos@pl.nuu
        ) 
)

Now you can use further logic:

foreach($array as $ind=>$record){
    if (isset($tmp1[$record['ad_owner_email']]) && !empty($tmp1[$record['ad_owner_email']]) )
    { 
        if (in_array($record['email_adr'],$tmp1[$record['ad_owner_email']])) 
        { 
            // index of current value in $tmp1 array
            $tm1 = array_search($record['ad_owner_email'],$tmp1[$record['email_adr']]); 

            // delete an element from $tmp1 and from $array
            unset($tmp1[$record['email_adr']][$tm1]); 
            unset($array[$ind]);  
        }
    }     
}  

Demo

EDIT According to the request below

 $array = [["id"=>"111","email_adr"=>"AAA","ad_owner_email"=>"BBB"], ["id"=>"111","email_adr"=>"BBB","ad_owner_email"=>"CCC"], ["id"=>"111","email_adr"=>"BBB","ad_owner_email"=>"AAA"], <--discarded ["id"=>"500","email_adr"=>"QQQ","ad_owner_email"=>"PPP"], ["id"=>"500","email_adr"=>"PPP","ad_owner_email"=>"QQQ"], <--discarded ["id"=>"1000","email_adr"=>"PPP","ad_owner_email"=>"QQQ"], <-saved because id=1000 and differs from id=500 ]; --------==::Desired result::==----------- Array ( [0] => Array ( [id] => 111 [email_adr] => AAA [ad_owner_email] => BBB ) [1] => Array ( [id] => 111 [email_adr] => BBB [ad_owner_email] => CCC ) [2] => Array ( [id] => 500 [email_adr] => QQQ [ad_owner_email] => PPP ) [3] => Array ( [id] => 1000 [email_adr] => PPP [ad_owner_email] => QQQ ) )

you can use next logic instead of previous:

// removes duplicate elements from multidimentional array
$array = array_unique($array, SORT_REGULAR);

// foreach($array ...) //<-- creating an array $tmp1

foreach($array as $ind=>$record){

    $id       = $record['id'];
    $em_owner = $record['ad_owner_email'];
    $em_adr   = $record['email_adr'];

    if (isset( $tmp1[$id][$em_owner] ) && 
        !empty( $tmp1[$id][$em_owner] ) && 
        in_array( $em_adr,   $tmp1[$id][$em_owner] ) &&
        in_array( $em_owner, $tmp1[$id][$em_adr] )
        )
    {    
        // indexes of pair values (both, direct and vice versa)
        $tm1 = array_search($em_adr,   $tmp1[$id][$em_owner]);
        $tm2 = array_search($em_owner, $tmp1[$id][$em_adr]);

        // index of the row in main data set where these values a placed in defined positions.
        $in = getIndex($array, ['a'=>$em_owner, 'b'=>$em_adr, 'c'=>$id]);

            // removing data about paired values in $tmp1 array and in the main $array 
            unset( $tmp1[$id][$em_adr][$tm2] );  
            unset( $tmp1[$id][$em_owner][$tm1] );  
            unset( $array[$in] );  
    }     
} 

// additional function for receiving index of the row
function getIndex($data,$ne){
    foreach($data as $key=>$val){
        if ($val['id'] === $ne['c'] && $val['email_adr'] === $ne['a'] && $val['ad_owner_email'] === $ne['b']) return $key;
    }
    return -1;
}

Demo2

If you have a problem with SORT_REGULAR then you can use next code instead of mentioned array_unique() :

$array = array_map("unserialize", array_unique(array_map("serialize", $array)));