Gruppierung von Arrays in PHP und Zählung von Daten

Question

Kürzlich arbeite ich an einem Projekt, das 'Superheros' und 'Supervillains' nach ihrer 'Franchise' und dem Ursprung von 'Superpower' kategorisiert. Ich möchte Daten aus Datenbank wie Array 1 abrufen und zeigt sie als Array 2 in PHP.

Array #1 

Array 
(
    [0] => Array 
    (
     [id] => 101 
     [Name] => Superman 
     [Franchise] => DC Comics 
     [Superpower] => Inherent 
    ) 

    [1] => Array 
    (
     [id] => 908 
     [Name] => Batman 
     [Franchise] => DC Comics 
     [Superpower] => Acquired 
    ) 

    [2] => Array 
    (
     [id] => 228 
     [Name] => Wolverine 
     [Franchise] => Marvel 
     [Superpower] => Acquired 
    ) 

    [3] => Array 
    (
     [id] => 158 
     [Name] => Iron Man 
     [Franchise] => Marvel 
     [Superpower] => Acquired 
    ) 

    [4] => Array 
    (
     [id] => 978 
     [Name] => Thor 
     [Franchise] => Marvel 
     [Superpower] => Inherent 
    ) 
) 

Array # 1 Elemente gruppiert auf ihre ‚Franchise‘ zu stützen und zählen, wie viele von ihnen ‚Inherent‘ oder ‚Erworbene‘ im Sinne von ‚Supermacht‘ sind.

Array #2 


Array 
(
    [DC Comics] => Array 
    (
     [Inherent] => 1 
     [Acquired] => 1 
    ) 

    [Marvel] => Array 
    (
     [Inherent] => 1 
     [Acquired] => 2 
    ) 
) 

Answer 1

Hier ist der Code, ohne viel Logik,

foreach ($array1 as $val) { 
    if(!isset($array2[$val['Franchise']])) { 
     $array2[$val['Franchise']] = array('Inherent' => 0, 'Acquired' => 0); 
    } 
    $array2[$val['Franchise']][$val['Superpower']]++; 
} 

print_r($array2); 

Answer 2

1. array_column() Funktion einen inneren Schlüssel aus einem 2D-Array aggregieren.

2. array_count_values() Funktion zählt alle Werte eines Arrays.

Mit diesem Code-Schnipsel für Zählwerte:

$a = array (array ("id" => "101", "Name" => "Superman", "Franchise" => "DC Comics", "Superpower" => "Inherent"), 
    array ("id" => "908", "Name" => "Batman", "Franchise" => "DC Comics", "Superpower" => "Acquired"), 
    array ("id" => "228", "Name" => "Wolverine", "Franchise" => "Marvel", "Superpower" => "Acquired"), 
    array ("id" => "158", "Name" => "Iron Man", "Franchise" => "Marvel", "Superpower" => "Acquired"), 
    array ("id" => "978", "Name" => "Thor", "Franchise" => "Marvel", "Superpower" => "Inherent")); 
    echo "<pre>"; 
$return = array(); 
// first group array values by franchise 
foreach($a as $val) { 
    if (!isset($return[$val['Franchise']])) { 
     $return[$val['Franchise']] = array(); 
    } 
    $return[$val['Franchise']][] = $val; 
} 
$arr = array(); 
// count elements by key value pair in particular franchise 
foreach ($return as $key => $value) { 
    $tmp = array_count_values(array_column($value, 'Superpower')); 
    $arr[$key] = $tmp; 
} 
print_r($arr); 

Demo is here

Answer 3

Mit Einzel- und kurzen array_reduce:

// $arr is your initial array 
$result = array_reduce($arr, function($r, $v){ 
    if (isset($r[$v["Franchise"]][$v["Superpower"]])) { 
     $r[$v["Franchise"]][$v["Superpower"]] += $r[$v["Franchise"]][$v["Superpower"]]; 
    } else { 
     $r[$v["Franchise"]][$v["Superpower"]] = 1; 
    } 
    return $r; 
}, []); 

print_r($result); 

Der Ausgang:

Array 
(
    [DC Comics] => Array 
     (
      [Inherent] => 1 
      [Acquired] => 1 
     ) 

    [Marvel] => Array 
     (
      [Acquired] => 2 
      [Inherent] => 1 
     ) 
)