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<?php $array_table_name = [ 'table_1', 'table_2', 'table_3', ]; $search_id = 1; $selectsArray = []; foreach ($array_table_name as $table_name) { $selectsArray[] = "SELECT * FROM $table_name WHERE id='$search_id'\n"; } $selectsUnion = implode("UNION ALL\n", $selectsArray) . "ORDER BY date_added \nLIMIT 1"; echo $selectsUnion;

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