查找与阵列相同的密钥的所有项目，并在一个新的

Question

结合他们让我们假设我们有一个多维数组象下面这样：

$obj = array 
(
array("carName"=>"Volvo","carColor"=>"Red", "carSpeed"=> "100 mph"), 
array("carName"=>"Volvo","carColor"=>"Blue", "carSpeed"=> "100 mph"), 
array("carName"=>"BMW","carColor"=>"White", "carSpeed"=> "120 mph"), 
array("carName"=>"BMW","carColor"=>"Grey", "carSpeed"=> "120 mph") 
); 

我怎么能在一个单一的阵列组合每"carName"的"carColor"所以我得到：

$newObj = array 
(
array("carName"=>"Volvo","carColor"=> array("Red", "Blue"), "carSpeed"=> "100 mph"), 
array("carName"=>"BMW","carColor"=> array("White", "Grey"), "carSpeed"=> "120 mph") 
); 

Answer 1

如果你的名字与车名的每个阵列（不知道的事项），你可以这样来做

foreach($obj as $x=>$y){ 
$new[$y['carName']]['carName']=$y['carName']; 
$new[$y['carName']]['carColor'][]=$y['carColor']; 
$new[$y['carName']]['carSpeed']=$y['carSpeed']; 
}