How can the use of deprecated mysql_* functions impact the functionality of PHP code?

The use of deprecated mysql_* functions can impact the functionality of PHP code because these functions are no longer supported and can lead to security vulnerabilities and compatibility issues. To resolve this, you should switch to using MySQLi or PDO extensions for database operations in PHP. 

// Using MySQLi extension to connect to a database
$mysqli = new mysqli('localhost', 'username', 'password', 'database_name');

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

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

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

// Close connection
$mysqli->close();

Keywords

deprecated mysql_ functions PHP code functionality impact

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