What are the best practices for handling user input in PHP to avoid errors and confusion in code execution?

When handling user input in PHP, it is important to sanitize and validate the data to prevent errors and security vulnerabilities. One common practice is to use filter_input() function to sanitize input and validate it against a specific filter type. Additionally, using prepared statements when interacting with a database can help prevent SQL injection attacks. 

// Sanitize and validate user input
$input = filter_input(INPUT_POST, 'user_input', FILTER_SANITIZE_STRING);

// Check if input is not empty
if(!empty($input)) {
    // Proceed with processing the input
    echo "User input: " . $input;
} else {
    // Handle empty input error
    echo "Error: Empty input";
}

Keywords

validation sanitization htmlspecialchars filter_input error handling

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