What are some best practices for handling email addresses and paths in PHP scripts?

When handling email addresses and file paths in PHP scripts, it's important to sanitize and validate user input to prevent security vulnerabilities such as injection attacks. Use built-in PHP functions like filter_var() with the FILTER_VALIDATE_EMAIL flag for email addresses, and realpath() for file paths to ensure they are in the correct format and safe to use in your scripts. 

// Validate and sanitize email address
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);
if (!$email) {
    // Handle invalid email address
}

// Validate and sanitize file path
$file = realpath($_POST['file']);
if (!$file) {
    // Handle invalid file path
}

Keywords

validation sanitization filter_var path manipulation email headers

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