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Continue to ChatPHP Array Function Quiz: <code>array_udiff()</code>; <code>array_uintersect_assoc()</code>; <code>array_uintersect_uassoc()</code>; <code>array_uintersect()</code>; <code>array_unique()</code>; <code>array_unshift()</code>; and <code>array_values()</code>. https://sharedsapience.info/2018/05/24/php-array-function-quiz-array_udiff-array_uintersect_assoc-array_uintersect_uassoc-array_uintersect-array_unique-array_unshift-and-array_values/