What are common validation techniques for password input in PHP forms?

When validating password input in PHP forms, common techniques include checking for a minimum length, enforcing the use of special characters, and comparing the password input with a confirmation field. This helps ensure that users create strong and secure passwords that meet certain criteria. 

$password = $_POST['password'];

if(strlen($password) < 8){
    // Password must be at least 8 characters long
    // Handle error message or redirect back to form
}

if(!preg_match('/[A-Za-z].*[0-9]|[0-9].*[A-Za-z]/', $password)){
    // Password must contain at least one letter and one number
    // Handle error message or redirect back to form
}

$confirmPassword = $_POST['confirm_password'];

if($password !== $confirmPassword){
    // Password and confirm password do not match
    // Handle error message or redirect back to form
}

Keywords

password validation PHP forms regular expressions password strength error handling

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