在两个数组之间设置新的/删除/更改的键=>值对

Question

我有两个名为$ old和$ new的多维数组。我想比较这两个数组，并添加新的key =>数值new $ new什么k => v是添加新的，删除或更改二者之间。

这些都是数组：

$old = array(
    array('id'=> 111,'color'=> 'blue'), 
    array('id'=> 112,'color'=> 'red'), 
    array('id'=> 113,'color'=> 'black'), 
    array('id'=> 114,'color'=> 'smoke') 
); 

$new = array(
     array('id'=> 111,'color'=> 'green'), 
     array('id'=> 112,'color'=> 'red'), 
     array('id'=> 113,'color'=> ''), 
     array('color'=> 'new color') 
    ); 

我想检查2数组新的，旧的和新的返回数组$ END_RESULT。

$end_result = array(
     array('id'=> 111,'color'=> 'green','action'=>'changed'), 
     array('id'=> 112,'color'=> 'red','action'=>''), 
     array('id'=> 113,'color'=> '','action'=>'remove'), 
     array('color'=> 'new color','action'=>'new'), 
     array('id'=> 114,'color'=> 'smoke','action'=>'remove') 
    ); 

我写：

$newarray = array(); 
foreach ($new as $key_new => $value_new) { 
    $newarray[$key_new] = $value_new; 
    if(!isset($value_new['id'])){ 
     $newarray[$key_new]['action'] = 'new'; 
    }else {   
     foreach ($old as $key_old => $value_old) {    
      if($value_new['id'] == $value_old['id']){ 
       if(empty($value_new['color'])){      
        $newarray[$key_new]['action'] = 'remove'; 
       }else { 
        if($value_new['color'] != $value_old['color']){ 
         $newarray[$key_new]['action'] = 'changed'; 
        } 
       } 

      } 

     } 
    } 

} 
echo json_encode($newarray); 

//result: [{"id":111,"color":"green","action":"changed"},{"id":112,"color":"red"},{"id":113,"color":"","action":"remove"},{"color":"new color","action":"new"}] 

但是！如何在旧的阵列中检查密钥ID 114，并在$ newarray中设置动作“删除”

谢谢！

Answer 1

这是我的代码解决方案，你应该试试看。

$old = array(
    array('id'=> 111,'color'=> 'blue'), 
    array('id'=> 112,'color'=> 'red'), 
    array('id'=> 113,'color'=> 'black'), 
    array('id'=> 114,'color'=> 'smoke') 
); 

$new = array(
    array('id'=> 111,'color'=> 'green'), 
    array('id'=> 112,'color'=> 'red'), 
    array('id'=> 113,'color'=> ''), 
    array('color'=> 'new color') 
); 

// Set the output array to the new array, which is the gradually compared to the old one 
$array = $new; 
foreach ($old as $old_key => $oldarray) 
{ 
    // Flag is to check if the old id had any match in the new, else it is removed 
    $flag = true; 
    foreach ($new as $new_key => $newarray) 
    { 
     if (empty($newarray['id'])) 
     { 
      $array[$new_key]['action'] = 'new'; 
     } 
     else if ($newarray['id'] == $oldarray['id']) 
     { 
      $flag = false; 
      if (empty($newarray['color'])) 
      { 
       $array[$new_key]['action'] = 'remove'; 
      } 
      else if ($newarray['color'] != $oldarray['color']) 
      { 
       $array[$new_key]['action'] = 'change'; 
      } 
     } 
    } 
    if ($flag) 
    { 
     // Make sure we don't override any index already existing 
     $key = 0; 
     while (array_key_exists($key, $array)) 
     { 
      $key++; 
     } 
     $array[$key] = $oldarray; 
     $array[$key]['action'] = 'remove'; 
    } 
} 

echo json_encode($array); 

// Result: [{"id":111,"color":"green","action":"change"},{"id":112,"color":"red"},{"id":113,"color":"","action":"remove"},{"color":"new color","action":"new"},{"id":114,"color":"smoke","action":"remove"}]