Which PHP function is used to establish a database connection?*connect_db()db_connect()pdo_connect()mysqli_connect()

Break Down the Problem

1. Identify the PHP functions related to database connections.
2. Determine which function is standard for establishing a database connection.

Relevant Concepts

• Functions in PHP are used for various operations, including database interactions.
• Familiarity with MySQL and PDO (PHP Data Objects) connections is essential.

Analysis and Detail

1. connect_db(): Not a standard PHP function for database connection.
2. db_connect(): Also not a standard PHP function and could be user-defined.
3. pdo_connect(): While this may suggest a connection using PDO, it is not the standard PHP function name.
4. mysqli_connect(): This is a standard function in PHP for connecting to a MySQL database.

Verify and Summarize

• The correct option among the given choices for establishing a database connection in PHP is mysqli_connect(). This function is widely used for connecting to MySQL databases using the MySQL Improved (mysqli) extension.

Final Answer

The PHP function used to establish a database connection is mysqli_connect().