What potential issues can arise when mixing MySQL functions with PHP functions in a script?

Potential issues that can arise when mixing MySQL functions with PHP functions in a script include security vulnerabilities, SQL injection attacks, and compatibility issues with different versions of MySQL and PHP. To solve these issues, it's recommended to use prepared statements with parameterized queries to prevent SQL injection attacks, sanitize user input, and validate data before using it in MySQL queries. 

// Example of using prepared statements with parameterized queries to prevent SQL injection attacks
$mysqli = new mysqli("localhost", "username", "password", "database");

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

// Prepare a SQL query with a parameterized query
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ?");

// Bind parameters
$stmt->bind_param("s", $username);

// Set parameters and execute the query
$username = "example";
$stmt->execute();

// Get the result
$result = $stmt->get_result();

// Fetch data
while ($row = $result->fetch_assoc()) {
    echo "Username: " . $row['username'] . "<br>";
}

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

Keywords

MySQL functions PHP functions script compatibility data manipulation

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