<?php $test = [ 3 => 'a', 2 => 'b', 1 => 'a' ]; array_walk($test, fn(&$value, $key) => $value=['key'=>$key,'value'=>$value]); uasort($test, fn($a, $b) => $a['value'] <=> $b['value'] ?: $a['key'] <=> $b['key']); array_walk($test, fn(&$pair) => $pair=$pair['value']); var_dump($test);
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