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<?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) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'He Said "Hello World"', 1 => 'He Said "Καλημέρα Κόσμε" To Me', 2 => 'Ryan\'s Shirts Are Very Large', )

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