In what situations should a developer use mysql_query and mysql_close functions in PHP code?

Developers should use the `mysql_query` function in PHP code when they need to send a query to the MySQL database. This function is used to execute SQL queries such as SELECT, INSERT, UPDATE, etc. On the other hand, the `mysql_close` function should be used to close the connection to the MySQL server once all database operations are completed in order to free up resources. 

// Establish a connection to the MySQL database
$connection = mysql_connect("localhost", "username", "password");

// Check if the connection was successful
if (!$connection) {
    die("Connection failed: " . mysql_error());
}

// Select the database to work with
$db_selected = mysql_select_db("database_name", $connection);

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

// Process the query result

// Close the connection
mysql_close($connection);

Keywords

mysql_query mysql_close PHP database SQL

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