<?php $pipedExclusions = 'SMK|USA|AUS'; echo preg_replace_callback( '~\b(?:(?:' . $pipedExclusions . ')(*SKIP)(*FAIL)|\p{Lu}+)\b~u', fn($m) => mb_convert_case($m[0], MB_CASE_TITLE), 'SMK SUNGAI PUNAI' );
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