How can PHP developers ensure the security of user authentication in web applications?

To ensure the security of user authentication in web applications, PHP developers should use secure password hashing algorithms, implement measures to prevent SQL injection and cross-site scripting attacks, enforce strong password policies, and use HTTPS to encrypt data transmission. 

// Example of secure password hashing using PHP password_hash() function
$password = "user_password";
$hashed_password = password_hash($password, PASSWORD_DEFAULT);

Keywords

password hashing secure sessions CSRF protection SQL injection prevention two-factor authentication

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