Show only unique values from Array

Question

I have the following array in php:

array(12) {
  [0]=>
  array(2) {
    ["adress"]=>
    string(17) "Kungsvägen 118 A "
    ["dob"]=>
    string(10) "1969-06-17"
  }
  [1]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1969-06-17"
  }
  [2]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1980-05-22"
  }
  [3]=>
  array(2) {
    ["adress"]=>
    string(12) "Myntvägen 8 "
    ["dob"]=>
    string(10) "1980-05-22"
  }
  [4]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1993-05-09"
  }
  [5]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1989-06-28"
  }
  [6]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1991-03-17"
  }
  [7]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1989-10-30"
  }
  [8]=>
  array(2) {
    ["adress"]=>
    string(23) "Gasslanda VÄSTERGÅRD 2 "
    ["dob"]=>
    string(10) "1980-10-30"
  }
  [9]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1980-10-30"
  }
  [10]=>
  array(2) {
    ["adress"]=>
    string(14) "Skolgatan 1 B "
    ["dob"]=>
    string(10) "1990-05-01"
  }
  [11]=>
  array(2) {
    ["adress"]=>
    string(11) "Ågatan 6 A "
    ["dob"]=>
    string(10) "1990-05-01"
  }
}

I want to print out the unique adress-values in this array when I'm doing an foreach. As you can see, Skolgatan 1 B appears several times in the array, so I want to print it out just once in my loop. How can I do this? I have tried

array_unique([$newArray['adress']);

but that does not work.

Well, you can alternatively save what you have printed, and if it's already printed, skip printing in the foreach :) — Ivan Yonkov
– Ivan Yonkov, Commented Sep 18, 2014 at 6:47
Which dob should be retained? The first encountered row? The last encountered row? The highest date value? The lowest date value? We don't know because there is no minimal reproducible example. — mickmackusa
– mickmackusa ♦, Commented Feb 12 at 20:37
Potentially related: Remove duplicate objects from array based on one value, keep lowest of other value in PHP? and php filter array values and remove duplicates from multi dimensional array and Remove duplicate in array based on column value and Filter/Remove rows where column value is found more than once in a multidimensional array — mickmackusa
– mickmackusa ♦, Commented Feb 12 at 20:41

user4053056 · Accepted Answer · 2014-09-18 06:50:23Z

1

$unique = array();
foreach($array as $item)
    $unique[$item['adress']] = $item;

Then use $unique

answered Sep 18, 2014 at 6:50

user4053056

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Comments

u_mulder · Accepted Answer · 2014-09-18 06:49:04Z

0

Something like this should work:

$printed_vals = array();
foreach ($array as $item) {
    if (!in_array($item['adress'], $printed_vals)) {
        print_r($item);
        $printed_vals[] = $item['adress'];
    }
}

answered Sep 18, 2014 at 6:49

u_mulder

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Comments

Ole Haugset · Accepted Answer · 2014-09-18 06:52:48Z

0

This is how I would have solved this problem. Hope it helps.

$non_duplicates = array();
$i=0;
foreach( $addresses AS $address ){
    if( !in_array( $address['adress'], $non_duplicates ) ){
        // Use one of the below array_push statements
        array_push( $non_duplicates, $i ); // if you want to get the array key position
        array_push( $non_duplicates, $address['adress'] ); // if you only want a new array of unique addresses
    }
    $i++;
}

If you have chosen to only return key positions to $non_duplicates yo can then retrieve your unique positions from you array by:

foreach( $non_duplicates AS $key ){
    echo $addresses[$key];
}

answered Sep 18, 2014 at 6:52

Ole Haugset

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Comments

Tapos · Accepted Answer · 2014-09-18 06:56:02Z

0

I guess you want to print address once but dob in multiple times.. in that case you can do something like followings

$printed_vals = array();

foreach ($array as $item) {
    $printed_vals[$item['adress']][] = $item['dob'];
}

foreach ($printed_vals as $address => $values) {
    echo $address . " => " . implode(",", $values);
}

answered Sep 18, 2014 at 6:56

Tapos

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