<?php $foo = ["a", "B", "æ", "Æ", "c", "A", "b", "C", "1"]; usort($foo, function($a, $b) { return [mb_strtoupper($a), $a] <=> [mb_strtoupper($b), $b]; }); var_export($foo);
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Value for `_results` contains invalid data `array`