Get unique column values from an array of objects [duplicate]

Question

I have an array of objects.

What I need is to take each [name] of each object in put into another array, but I don't want duplicates.

How can I do it?

Array (
    [0] => ADOFetchObj Object
        (
            [name] => Team 1
            [att] => None
            [idGrupo] => 1
            [idModulo] => 4
            [ler] => 1
            [escrever] => 1
            [excluir] => 1
        )

    [1] => ADOFetchObj Object
        (
            [name] => Team 1
            [nomeModulo] => Aplicar Juros
            [idGrupo] => 1
            [idModulo] => 1006
            [ler] => 1
            [escrever] => 1
            [excluir] => 1
        )

    [2] => ADOFetchObj Object
        (
            [name] => Team 2
            [att] => None
            [idGrupo] => 1
            [idModulo] => 10
            [ler] => 1
            [escrever] => 1
            [excluir] => 1
        )

    [3] => ADOFetchObj Object
        (
            [name] => Team 2
            [att] => None
            [idGrupo] => 1
            [idModulo] => 1012
            [ler] => 1
            [escrever] => 1
            [excluir] => 1
        )
)

I don't understand. What happens when you have two identical names? How do you know which to choose? — Expedito
– Expedito, Commented Nov 27, 2012 at 18:18
I want to take every [name]of this array above and put into another array, but wihtout duplicates. Got it? — Lucas Veiga
– Lucas Veiga, Commented Nov 27, 2012 at 18:18
@PédeLeão Well... they're the same, so what does it matter? — Waleed Khan
– Waleed Khan, Commented Nov 27, 2012 at 18:18
@RocketHazmat Internal placeholder for record objects. Used by ADORecordSet->FetchObj(). — Lucas Veiga
– Lucas Veiga, Commented Nov 27, 2012 at 18:20
@LucasVeiga: This is an array of objects, not an array of arrays. — netcoder
– netcoder, Commented Nov 27, 2012 at 18:21

Naftali · Accepted Answer · 2012-11-27 18:55:10Z

6

You can do this:

$names = array();
foreach($arr as $list) {
    $names[$list->name] = true; // can be *any* arbitrary value
}
$names = array_keys($names);

This will work because by definition array keys have to be unique.

edited Nov 27, 2012 at 18:55

answered Nov 27, 2012 at 18:17

Naftali

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9 Comments

Naftali Over a year ago

No problem @LucasVeiga happy to help ^_^

netcoder Over a year ago

This is probably the most efficient way.

Naftali Over a year ago

@netcoder yea... I do not understand all the if statements and array_unique's in the other answers... they add too much overhead :-P

Intrepidd Over a year ago

Well this one is definitely the most elegant but not really the easiest to understand for a beginner imho ;)

Naftali Over a year ago

@Intrepidd what is hard to understand? I will try to explain it better.

|

Waleed Khan · Accepted Answer · 2012-11-27 18:17:08Z

3

array_unique(array_map(function($element) {
    return $element->name;
}, $my_array));

answered Nov 27, 2012 at 18:17

Waleed Khan

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1 Comment

user895378 Over a year ago

+1 As far as I'm concerned, this is the only answer worth looking at. The standard library solves this problem without the need for a loop.

Intrepidd · Accepted Answer · 2012-11-27 18:22:18Z

3

There you go

$res = array();

foreach($arr as $var)
{
    if(!in_array($var->name, $res))
    {
      $res[] = $var->name;
    }
}

edited Nov 27, 2012 at 18:22

answered Nov 27, 2012 at 18:17

Intrepidd

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2 Comments

netcoder Over a year ago

$var is an object, not an array. Did anybody read this question properly before answering it?

Intrepidd Over a year ago

Corrected, description was misleading : "I have an array inside of another array."

TachyonVortex · Accepted Answer · 2012-11-27 18:16:51Z

2

First, copy the names to a new array:

$arrNames = array();

foreach($arrOriginal as $objObject) {
    array_push(
        $arrNames,
        $objObject->name
    );
}

Then remove the duplicate names:

$arrNames = array_unique($arrNames);

answered Nov 27, 2012 at 18:16

TachyonVortex

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Comments

Sam · Accepted Answer · 2012-11-27 18:28:04Z

0

$n = array();

foreach($array as $d) $n[] = $d->name;

$n = array_unique($n);

answered Nov 27, 2012 at 18:28

Sam

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