Are special characters like %, !, ?, >, - safe to include in INSERT or UPDATE statements in PHP, and how should they be handled for security?

Special characters like %, !, ?, >, and - can potentially be used for SQL injection attacks if not properly handled. To prevent this, you should always use prepared statements with parameterized queries when executing INSERT or UPDATE statements in PHP. This helps to sanitize user input and prevent malicious SQL injection attacks. 

// Example of using prepared statements with parameterized queries to safely insert data into a database

// Assuming $conn is your database connection

// Prepare an SQL statement
$stmt = $conn->prepare("INSERT INTO table_name (column1, column2) VALUES (?, ?)");

// Bind parameters
$stmt->bind_param("ss", $value1, $value2);

// Set parameters and execute
$value1 = "safe_value1";
$value2 = "safe_value2";
$stmt->execute();

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

Keywords

PHP special characters security SQL injection escaping

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