Effizientere Art der Zusammenführung von zwei Arrays

Question

Ich vergleiche jedes Element des Arrays mit jedem anderen Element des Arrays und wenn zwei Elemente die gleiche Quelle/Ziel haben, verschmilze Ziel/Quelle I das innere Array mit Mitarbeitern z.

0=> source - 3 target - 4 officers => 0 - 'Aberdeen Asset Management PLC' 
1=> source - 3 target - 4 officers => 0 - 'whatever' 

es würde

0=> source - 3 target - 4 officers => 0 - 'Aberdeen Asset Management PLC', 1 - 'whatever' 

Hier ist, wie die Daten aussehen zu

zusammengeführt werden: auf mehr Zeilen mit 1000

Mein Code ist wirklich ineffizient durch die gehen die Ausführung dauert etwa 90 Sekunden, was für solche Dinge nicht akzeptabel ist.

foreach ($edges as $i => &$edge) { 
     for ($j = $i + 1; $j < count($edges); $j++) { 
      if ($edge['source'] == $edges[$j]['source'] && $edge['target'] == $edges[$j]['target']) { 
       foreach ($edges[$j]['officers'] as $officer) { 
        array_push($edge['officers'], $officer); 
       } 
       array_splice($edges, $j, 1); 
      } 
     } 
    } 

Answer 1

Ich glaube, Sie sollten dies tun (aktualisiert):

// we will have new array with officers 
$new_items = array(); 
foreach ($edges as $edge) { 
    // create unique keys for `source-target` and `target-source` pairs 
    $source_target = $edge['source'] . ':' . $edge['target']; 
    $target_source = $edge['target'] . ':' . $edge['source']; 

    // check if unique keys exists in `new_items` 
    if (!isset($new_items[$source_target]) && !isset($new_items[$target_source])) { 
     // if unique key doesn't exist - create a new one 
     $new_items[$source_target] = $edge; 
    } elseif (isset($new_items[$source_target])) { 
     // if unique key exists `$source_target` - add an officer to it 
     $new_items[$source_target]['officers'][] = $edge['officers'][0]; 
    } else { 
     // if unique key exists `$target_source` - add an officer to it 
     $new_items[$target_source]['officers'][] = $edge['officers'][0]; 
    } 
} 

// for returning to numeric indexes use `array_values` 
$new_items = array_values($new_items); 

Answer 2

Die Lösung mit array_search, array_keys, array_slice und array_merge Funktionen:

// an exemplary array 
$edges = [ 
    0 => ['source' => 3, 'target' => 4, 'officers' => ['Aberdeen Asset Management PLC']], 
    1 => ['source' => 3, 'target' => 4, 'officers' => ['whatever']], 
    3 => ['source' => 4, 'target' => 7, 'officers' => ['Jason']], 
    4 => ['source' => 4, 'target' => 5, 'officers' => ['John']], 
    5 => ['source' => 4, 'target' => 7, 'officers' => ['Bourne']] 
]; 

foreach ($edges as $k => &$v) { 
    $next_slice = array_slice($edges, array_search($k, array_keys($edges)) + 1); 
    foreach ($next_slice as $key => $item) { 
     if ($item['source'] == $v['source'] && $item['target'] == $v['target']) { 
      $v['officers'] = array_merge($v['officers'], $item['officers']); 
      unset($edges[$k + $key + 1]); 
     } 
    } 
} 

print_r($edges); 

DEMO link