php - Create an array of key difference using two array -

how can find key deference array using 2 arrays first array :

$array_1 = array('300','200','500');

second array :

$array_2 = array('500','300','200');

$array_2 generating applying rsort $array_1

then want generate array of key comparing value of $array_1 , key of $array_2.output array of

$key_array = ('1','2','0');

use array_flip() on $array_2 convert keys values , vice versa. can find original keys.

$flip_2 = array_flip($array_2); $key_array = array_map(function($el) use ($flip_2) { return $flip_2[$el]; }, $array_1);

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