<?php $first = [ 'c' => 'd', 'm' => 'n', ]; $second = [ 'C' => 'd', // first encounter, qualifying key, qualifying value (['c' => 'd'] is removed from result) 'c' => 'D', // doesn't matter 'm' => 'N', // first encounter, qualifying key, disqualifying value 'M' => 'n', // this should eliminate ['m' => 'n'], but doesn't get the chance ]; /* behavior discovered while crafting this answer: * https://stackoverflow.com/a/70817582/2943403 */ var_export( array_diff_uassoc( $first, $second, 'strcasecmp' ) ); // removes first-occurring, case-insensitive key, case-sensitive value
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