get group

// misalkan datanya

{
    "data": [{
        "id_karyawan": "S001",
        "nama_karyawab": "Paimin",
        "id_divisi": "D01",
        "nama_divisi": "Marketing"
    }, {
        "id_karyawan": "S002",
        "nama_karyawab": "Sudarmaji",
        "id_divisi": "D02",
        "nama_divisi": "Human Resource"
    }, {
        "id_karyawan": "S003",
        "nama_karyawab": "Agus",
        "id_divisi": "D01",
        "nama_divisi": "Marketing"
    }]
}


// ngambil group (dari divisi)

$myArray = array();
$idDivisi = array();

foreach($data['data'] as $dt){

    array_push($myArray,
        array(
            "id_divisi"=>$dt['id_divisi'],
            "nama_divisi"=>$dt['nama_divisi']
            )
        );
    if(in_array($dt['id_divisi'],$idDivisi)){
        array_pop($myArray);
    }
    array_push($idDivisi,$dt['id_divisi']);
};

echo json_encode($myArray);

// hasil

[{
    "id_divisi": "D01",
    "nama_divisi": "Marketing"
}, {
    "id_divisi": "D02",
    "nama_divisi": "Human Resource"
}]