Unique array not working in a foreach loop

Question

I am trying to stop an array of items from duplicating everytime the loop goes through. I would think unique array would solve my problem but it doesnt seem to be working. Is there an alternative or am I doing something wrong?

This is the array that i am parsing. For example bag shows up several times. I am trying get it to show up once.

Array
(
    [0] => bag
    [1] => wallet
    [2] => accessori
    [3] => sunglass
    [4] => clutch
    [5] => tote
)
Array
(
    [0] => handbag
    [1] => faux
    [2] => leather
    [3] => bag
    [4] => clutch
    [5] => hobo
    [6] => purs
    [7] => wallet
    [8] => tote
    [9] => messeng
)
Array
(
    [0] => bag
    [1] => book
)

This is my code.

foreach($json as $keywords){

    foreach($keywords as $keyword){

        print_r(array_unique($keyword['keywords']));

    }
}

Thank you in advance.

Are you trying to get unique records from all these 3 arrays? Please clarify this first. — Indrasis Datta
– Indrasis Datta, Commented Mar 14, 2016 at 7:58
1. array_unique() does not work recursively, you will have to implement a wrapper for that and 2. I cannot spot any key named 'keywords' in your arrays... — arkascha
– arkascha, Commented Mar 14, 2016 at 7:59
What's your expected output? E.g. where should "bag" be included in the result array? — maxhb
– maxhb, Commented Mar 14, 2016 at 8:11

Halayem Anis · Accepted Answer · 2016-03-14 15:56:52Z

I've wrote array_unique() function for multidimensial array
First, i've merged all the arrays, applied array_unique() and after that recomposed the result

<?php
$input  = array( array('bag',   'wallet' ),
                    array('wallet', 'purs'  ),
                    array('book',   'purs'  )       
                  );
print_r (arrayUniqueMultidimensial($input));

function arrayUniqueMultidimensial($input) {                
    $merged = array();
    foreach ($input as $subArray) {
        $merged = array_merge($merged, $subArray);
    }

    $filteredArray  = array_unique($merged, SORT_STRING);
    $segment        = array(0); // segmentation
    foreach($input as $subArray) {
        $segment[] = $segment[count($segment)-1] + count($subArray);
    }

    $recomposed = array();
    for($i=1 ; $i<count($segment) ; $i++) {
        $startIndex = $segment[$i-1];
        $endIndex    = $segment[$i] ;
        $temp        = array();
        for ($j=$startIndex ; $j<$endIndex ; $j++) {
            if (array_key_exists($j, $filteredArray)) {
                $temp[] = $filteredArray[$j];
            }
        }
        $recomposed[] = $temp;
    }
    return ($recomposed);
}

BobGao · Accepted Answer · 2016-03-14 08:12:33Z

0

You can simply merge all arrays first, then do the array_unique

    $a = array(
        'bag',
        'wallet',
        'accessori',
        'sunglass',
        'clutch',
        'tote'
    );
    $b = array(
        'handbag',
        'faux',
        'leather',
        'bag',
        'clutch',
        'hobo',
        'purs',
        'wallet',
        'tote',
        'messeng',
    );
    $c = array(
        'bag',
        'book',
    );
    $d = array_merge($a, $b, $c);
    var_dump($d);
    $u = array_unique($d);
    var_dump($u);

compare the variables $d an $u.

answered Mar 14, 2016 at 8:12

BobGao

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