A PHP database writing operation class, with three categories
1. Filter input. The lightweight class input_filter is responsible for filtering parameters such as $_GET and $_POST. The return value type is an array and is used as a parameter of the made_sql class.
2. Convert to SQL statement class made_sql. The parameter type is array and table name (string). The key name of the array is the column name of the table, and the value is the inserted value. The return value type is string and is used as mysql -> Parameters of query method.
3. The database query class mysql uses single column mode and uses static methods to obtain objects. For details, please refer to the role of the instanceof operator.
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