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Continue to ChatPHP Array Function Quiz: <code>array_diff_key()</code>; <code>array_diff_uassoc()</code>; <code>array_diff_ukey()</code>; <code>array_diff()</code>; <code>array_fill_keys()</code>; <code>array_fill()</code>; and <code>array_filter()</code>. https://sharedsapience.info/2018/05/18/php-array-function-quiz-array_diff_key-array_diff_uassoc-array_diff_ukey-array_diff-array_fill_keys-array_fill-and-array_filter/