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<?php $array = array(1, 2, 3, 3); var_dump( array_unique( array_diff_assoc( $array, array_unique( $array ) ) ) );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [3]=> int(3) }