使用数组键创建新数组

Question

假设：

$data = array(
    "some"  => "163",
    "rand"  => "630",
    "om"    => "43",
    "words" => "924",
    "as"    => "4",
    "keys"  => "54"
);

我想要一个只使用与那些特定键匹配的键的新数组：

$keys = array( "some", "thing", "rand", "keys" );

我想返回一个包含这些键的数组，创建：

$arr = array(
     "some"   => "163",
     "rand"   => "630",
     "keys"   => "54"
);

Answer 1

您可以使用array_intersect_key()和array_flip()执行此操作：

$arr = array_intersect_key($data, array_flip($keys));

结果：

Array
(
    [some] => 163
    [rand] => 630
    [keys] => 54
)

Answer 2

$filteredArray = array_intersect_key($data, array_flip($keys)); 

是最简单的解决方案，

但只是为了与众不同：

$data = array(
    "some"  => "163",
    "rand"  => "630",
    "om"    => "43",
    "words" => "924",
    "as"    => "4",
    "keys"  => "54"
);

$keys = array( "some", "thing", "rand", "keys" );

$filteredArray = array_filter($data,function($item) use (&$data,$keys) { $retVal = false; if (in_array(key($data),$keys)) $retVal = true; next($data); return $retVal; });

var_dump($filteredArray);

Answer 3

$result = array_intersect_key($data, array_flip($keys));