10个能帮你在PHP中处理数据库的函数
1. mysqli_connect(): This function is used to connect to the database server. It takes four parameters – hostname, username, password, and database name.
2. mysqli_query(): This function is used to execute SQL queries. It takes two parameters – the connection object and the SQL query.
3. mysqli_fetch_array(): This function is used to retrieve data from the database. It takes two parameters – the result set and the type of array to return (associative or numeric).
4. mysqli_num_rows(): This function is used to count the number of rows returned by a SQL query. It takes one parameter – the result set.
5. mysqli_real_escape_string(): This function is used to escape special characters in a string before inserting it into a database. It takes one parameter – the string to be escaped.
6. mysqli_insert_id(): This function is used to retrieve the ID of the last inserted record. It takes one parameter – the connection object.
7. mysqli_error(): This function is used to retrieve the error message from the last operation. It takes one parameter – the connection object.
8. mysqli_affected_rows(): This function is used to retrieve the number of rows affected by the last operation. It takes one parameter – the connection object.
9. mysqli_close(): This function is used to close the database connection. It takes one parameter – the connection object.
10. mysqli_multi_query(): This function is used to execute multiple SQL queries in one call. It takes two parameters – the connection object and the SQL queries separated by semicolons.
