Php unique values in multidimensional array

I have done a lot of looking around on the overflow, and on google, but none of the results works for my specific case.

I have a placeholder array called $holder, values as follows:

    Array [ 
    [0] => Array [ 
        [id] => 1 
        [pid] => 121 
        [uuid] => 1  
        ]
    [1] => Array [ 
        [id] => 2 
        [pid] => 13
        [uuid] => 1
        ]
    [2] => Array [ 
        [id] => 5 
        [pid] => 121 
        [uuid] => 1
        ]
    ] 

I am trying to pull out distinct/unique values from this multidimensional array. The end result I would like is either a variable containing [13,121], or [preferrably] an array as follows: Array[ [0] => 13 [1] => 121 ]

Again I've tried serializing and such, but don't quite understand how that works when operating with a single key in each array.

I tried to be as clear as possible. I hope it makes sense...

asked May 2, 2012 at 6:01

MaurerPowerMaurerPower

1,9765 gold badges25 silver badges47 bronze badges

1

Seems pretty simple: extract all pid values into their own array, run it through array_unique:

$uniquePids = array_unique[array_map[function [$i] { return $i['pid']; }, $holder]];

The same thing in longhand:

$pids = array[];
foreach [$holder as $h] {
    $pids[] = $h['pid'];
}
$uniquePids = array_unique[$pids];

answered May 2, 2012 at 6:06

4

In php >= 5.5 you can use array_column:

array_unique[array_column[$holder, 'pid']];

answered May 25, 2015 at 14:48

1

try this

foreach[$arr as $key => $val] {
    $new_arr[] = $val['pid'];
}
$uniq_arr = array_unique[$new_arr];

answered May 2, 2012 at 6:08

NauphalNauphal

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Just iterate over it and apply an array_unique on the result:

foreach[$holder as $yourValues]{
    $pids[] = $yourValues['pid'];
}
$yourUniquePids = array_unique[$pids];

answered May 2, 2012 at 6:08

konsolenfreddykonsolenfreddy

9,4821 gold badge24 silver badges36 bronze badges

Assuming your array is called $holder:

$unique = array[];
foreach[ $holder as $h ]
    if[ ! in_array[$h, $unique ] ]
        $unique[] = $h;

is a slightly more efficient way than via array_unique, I believe. May be the same.

answered Feb 11, 2015 at 23:43

1

$uniquearray = [];
    for[$i=0;$i