Online PHP editor | output for NaijG

<?php $mysql = [ ['id' => 1, 'userid' => 655342], ['id' => 3, 'userid' => 777777], ['id' => 6, 'userid' => 454777], ]; $mongo = [ ['id' => 1, 'userid' => 655342, 'addr1' => '123 Test Ave', 'addr2' => 'MyCityState', 'zipcd' => '99955', 'items' => 888888], ['id' => 2, 'userid' => 989855, 'addr1' => '124 Test Ave', 'addr2' => 'MyCityState', 'zipcd' => '66955', 'items' => 887788], ['id' => 3, 'userid' => 777777, 'addr1' => '125 Test Ave', 'addr2' => 'MyCityState', 'zipcd' => '11955', 'items' => 886688], ['id' => 4, 'userid' => 666666, 'addr1' => '126 Test Ave', 'addr2' => 'MyCityState', 'zipcd' => '39954', 'items' => 885588], ]; var_export( array_uintersect($mongo, $mysql, fn($a, $b) => $a['userid'] <=> $b['userid']) );