<?php $strings = [ 'he said "hello worLd"', 'he sAId "καλημέρα ΚΌΣΜΕ" to me', "Ryan's shirts are verY large", ]; var_export( preg_replace_callback('/[^"]+/', fn($m) => mb_convert_case($m[0], MB_CASE_TITLE, "UTF-8"), $strings) );
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Value for `_results` contains invalid data `array`