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<?php function custom_function(string $str1, string $str2) : array { $arr1 = explode(' ', $str1); $arr2 = explode(' ', $str2); return array_combine(array_diff($arr1, $arr2), array_diff($arr2, $arr1)); } $str1 = "The cat was happy"; $str2 = "The cat is happy"; $diff = custom_function($str1, $str2); var_dump($diff);
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