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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code

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<?php $arr = [1, 3, 4, 6, 4, 2, 1, 1]; $res1 = array_count_values($arr); //var_export($res1); $res2 = array_filter($res1, fn($el)=>($el>1)); var_export(array_keys($res2));
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