Are there specific best practices for handling string concatenation in SQL queries within PHP code?

When concatenating strings in SQL queries within PHP code, it is best practice to use prepared statements to prevent SQL injection attacks and ensure proper escaping of special characters. This can be achieved by using parameterized queries with placeholders for dynamic values that need to be concatenated. 

// Example of using prepared statements for string concatenation in SQL queries
$mysqli = new mysqli("localhost", "username", "password", "database");

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

// Prepare SQL statement with placeholders
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ? AND password = ?");

// Bind parameters to placeholders
$stmt->bind_param("ss", $username, $password);

// Set parameter values
$username = "john_doe";
$password = "password123";

// Execute the query
$stmt->execute();

// Fetch results
$result = $stmt->get_result();

// Loop through results
while ($row = $result->fetch_assoc()) {
    // Handle results
}

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

Keywords

PHP SQL queries string concatenation security prepared statements

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