edit name

Update Mysqli_Manger.php

Update Mysqli_Manger.php

Update README.md

Update update_delete.php

Update select.php

Update optimize.php

Update multi_insert.php

Update insert.php

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Update Mysqli_Manger.php

Update README.md

Add conn() function and fix escape & magic quotes

Update Mysqli_Manger.php

Update db_config.php