How can PHP developers prevent email injection vulnerabilities in their code?

Email injection vulnerabilities can be prevented by validating user input and using proper sanitization techniques. PHP developers can sanitize email input by using the filter_var() function with the FILTER_VALIDATE_EMAIL filter. Additionally, developers should avoid concatenating user input directly into email headers to prevent potential injection attacks. 

$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

if ($email) {
    // Proceed with sending the email
} else {
    // Handle invalid email input
}

Keywords

email injection PHP developers code security validation filtering

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