What are some strategies for handling user input validation and error handling in PHP scripts?

User input validation and error handling are important aspects of PHP scripting to ensure data integrity and security. One strategy is to use built-in PHP functions like filter_input() to sanitize and validate user input. Another strategy is to use conditional statements and regular expressions to check for specific patterns or formats in user input. Additionally, using try-catch blocks can help catch and handle any errors that may occur during script execution. 

// Example of user input validation using filter_input() function

$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);

if (!$username) {
    // Handle error if username is empty or not valid
    echo "Please enter a valid username.";
} else {
    // Process the username
    echo "Hello, " . $username;
}

Keywords

filter_var htmlentities try-catch validation error_reporting

Related Questions