Php两个不同的数组，具有相同的键

I am new to php and still learning the language,

let say I have two array

For Example

Array
(
    [house_id] => 6
    [name] => Lake Villa
    [floor] => 5
    [unit] => 25
)

Array
(
    [house_id] => 6
    [name] => Lake Villa
    [floor] => 5
    [unit] => 25
    [parking_id] => 9
    [resident_count] => 4
)

How do i get the keys of 1st array onto second, what i am saying is, i just need house_id, name, floor, unit from second array and discard rest of the information.

However, they key is not same and dynamic, which means the first array key whatever returned is also present on second but with additional information. The information above is just an example and the keys might varies but whatever key on first array contains on second array too.

I tried this, but isn't working:

foreach($arr1 as $k=>$v) {
    foreach($arr2 as $j=>$w) {
        if(isset($arr2[$k]))
            $arr[$k] = $w;
    }
}

You could use array_intersect_key, to merge the arrays.

$newArray = array_intersect_key($array2, $array1);

foreach($arr2 as $key=>$val){
   if(!array_key_exists($key,$arr1))        
   unset($arr2[$key]);
}

Use array_intersect_key().

array_intersect_key() returns an array containing all the entries of array1 which have keys that are present in all the arguments.

Code

var_dump(array_intersect_key($array1, $array2));

change condition from

if(isset($arr2[$k]))

to

if($arr1[$k] == $arr2[$j])   // it will work.

and isset is used for checking the variable is set or not.

Try this:

foreach($arr2 as $k=>$v) {
    //Check if key is in first array
    if(!isset($arr1[$k])) {
        //Key not in first array, remove from second array. 
        unset($arr2[$k]); 
    }
}

try this

$result_array = array_intersect_key($arr2, $arr1);