In what situations should the use of deprecated functions like mysql_db_query be avoided in PHP programming?

The use of deprecated functions like mysql_db_query should be avoided in PHP programming as they are no longer supported and may lead to security vulnerabilities and compatibility issues in the future. It is recommended to use modern alternatives like mysqli or PDO for database operations to ensure better performance, security, and future-proof code. 

// Connect to the database using mysqli
$mysqli = new mysqli("localhost", "username", "password", "database");

// Check connection
if ($mysqli->connect_error) {
    die("Connection failed: " . $mysqli->connect_error);
}

// Perform a query using prepared statements
$stmt = $mysqli->prepare("SELECT * FROM table WHERE column = ?");
$stmt->bind_param("s", $value);
$value = "example";
$stmt->execute();
$result = $stmt->get_result();

// Fetch data
while ($row = $result->fetch_assoc()) {
    // Process data
}

// Close the statement and connection
$stmt->close();
$mysqli->close();

Keywords

deprecated functions mysql_db_query PHP programming security risk alternative functions

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