如何使用另一个数组中的值作为键从数组中选择值的子集？ [重复]

Question

This question already has an answer here:

• Get array values by keys 4 answers

Here's my array of $keys:

Array
(
    [0] => 1
    [1] => 3
    [2] => 4
)

And my $values:

Array
(
    [0] => Red
    [1] => Orange
    [2] => Yellow
    [3] => Green
    [4] => Blue
)

I want to create a new array of some of the values in $values using the values in $keys as keys:

Array
(
    [1] => Orange
    [3] => Green
    [4] => Blue
)

Obviously I can foreach to get the values I want, but I want to make sure I'm not overlooking something in the plethora of PHP array functions.

I've Googled the question, and the answer comes back as using array_combine, which won't achieve the desired output.

Your help is appreciated :)

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Answer 1

Flip the $keys array to make the values keys and then use array_intersect_key():

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

Returns the values from $values that have the same keys as the flipped $keys.