Custom form for password protected page

Question

I would like to create or modify the form of password protected pages. My problem is that: I need another input from the user. If the user gives the email and the password then he/she can see the protected post.

But I do not know how I should start it. Because I think... I have to rewrite the all password protected functionality, in order to handle the one plus input (the email) next to the password input (which is serviced by the WordPress automaticly)

I found this link: http://codex.wordpress.org/Using_Password_Protection . But here the article does not speak about the plus input fields, how I can add or not to the form.

Answer 1

For starters, you can hook into the password form. Then you can customize it. Something like:

add_filter( 'the_password_form', 'custom_password_form' );
function custom_password_form() {
global $post;
$o = '<form action="' . esc_url( site_url( 'wp-login.php?action=postpass', 'login_post' ) ) . '" method="post">
' . __( "This post is password protected. To view it please enter your password below: or add custom message" ) . '
<label for="Email">' . __( "Email:" ) . ' </label><input name="Email" type="text" size="20" required />
<label for="password">' . __( "Password:" ) . ' </label><input name="post_password" id="password" type="password" size="20" required/>
<input type="submit" name="Submit" value="' . esc_attr__( "Submit" ) . '" />
</form>
';
return $o;
}

This form will replace the existing password protected form, although I'm sure you can add an if statement for conditional use.