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Continue to ChatPHP Array Function Quiz: <code>array_flip()</code>; <code>array_intersect_assoc()</code>; <code>array_intersect_key()</code>; <code>array_intersect_uassoc()</code>; <code>array_intersect_ukey()</code>; <code>array_intersect()</code>; and <code>array_key_exists()</code>. https://sharedsapience.info/2018/05/19/php-array-function-quiz-array_flip-array_intersect_assoc-array_intersect_key-array_intersect_uassoc-array_intersect_ukey-array_intersect-and-array_key_exists/