Where can I find theoretical information on database operations in PHP, such as mysql_query and mysql_fetch_array?

To find theoretical information on database operations in PHP, such as mysql_query and mysql_fetch_array, you can refer to the official PHP documentation on MySQL functions. This documentation provides detailed explanations of each function, their parameters, return values, and usage examples. Additionally, online tutorials and forums dedicated to PHP programming often cover database operations extensively.

// Example of using mysql_query and mysql_fetch_array to fetch data from a MySQL database

// Connect to the database
$conn = mysql_connect("localhost", "username", "password");
mysql_select_db("database_name", $conn);

// Execute a query
$result = mysql_query("SELECT * FROM table_name");

// Fetch data and display it
while ($row = mysql_fetch_array($result)) {
    echo $row['column_name'] . "<br>";
}

// Close the connection
mysql_close($conn);