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$string = '%u0E17%u0E14%u0E2A%u0E2D%u0E1A%u0E04%u0E23%u0E31%u0E1A'; $string = preg_replace('/%u([0-9a-f]{4})/ie', "'&#'.hexdec('').';'", $string); // ทดสอบ