有效复制特定键的方法

Question

I want to copy elements of specific indices/keys from one php array to another. I came across this post and tried the following:

$a1=array(10,15,20,25,30);
$indices=array(2,4);
$result=array_intersect_key($a1,array_flip($indices));
print_r($result);

But my result is like this

Array ( [2] => 20 [4] => 30 ) 

I want the keys in the new array to start from [0]. ie., I want the result to be

Array ( [0] => 20 [1] => 30 ) 

I looked at array_combine() but is there any other efficient way to do this whole process.

Answer 1

Use array_values() to get just the array values of the returned array from array_intersect_key().

$result=array_values(array_intersect_key($a1,array_flip($indices)));

Demo