I have the following two arrays:
$array_one = array('colorZero'=>'black', 'colorOne'=>'red', 'colorTwo'=>'green', 'colorThree'=>'blue', 'colorFour'=>'purple', 'colorFive'=>'golden');
$array_two = array('colorOne', 'colorTwo', 'colorThree');
I want an array from $array_one
which only contains the key-value pairs whose keys are members of $array_two (either by making a new array or removing the rest of the elements from $array_one
)
How can I do that?
I looked into array_diff
and array_intersect
, but they compare values with values, and not the values of one array with the keys of the other.
As of PHP 5.1 there is array_intersect_key
(manual).
Just flip the second array from key=>value to value=>key with array_flip()
and then compare keys.
So to compare OP's arrays, this would do:
$result = array_intersect_key( $array_one , array_flip( $array_two ) );
No need for any looping the arrays at all.