Shortening if-statements of displaying errors

Is it possible to shorten this piece of PHP code?

Honestly, I think it does not look clean but like a mess.

if(Input::exists() && $token) {
    if($validation->error('firstname') && $validation->error('lastname')) {
        echo str_repeat(' ', 20), '↳ You did not enter your name.', "\n";
    } else if($validation->error('firstname')) {
        echo str_repeat(' ', 20), '↳ You did not enter your first name', "\n";
    } else if($validation->error('lastname')) {
        echo str_repeat(' ', 20), '↳ You did not enter your last name.', "\n";
    }
}
if(!Input::exists()) {
        echo str_repeat(' ', 20), '↳ We will address you by this name.', "\n";
}

if(Input::exists() && $token) {
    if($validation->error('emailConfirm') == 'match') {
        echo str_repeat(' ', 20), '↳ The email address you entered does not match.', "\n";
    } else if($validation->error('emailConfirm') == 'type') {
        echo str_repeat(' ', 20), '↳ You did not re-enter a valid email address.', "\n";
    } else if($validation->error('emailConfirm')) {
        echo str_repeat(' ', 20), '↳ You did not re-enter your email to confirm.', "\n";
    }
}else if(!Input::exists()) {
        echo str_repeat(' ', 20), '↳ Re-enter your email to make sure it\'s correct.', "\n";
    }

You are repeating the same code:

echo str_repeat(' ', 20), '↳ You did not enter your name.', "\n";

Replace it with a function which will do the job:

function message($content, $class = ''){
    return str_repeat(' ', 20) . '$content\n";
}

You are using construction:

if () {} else if() {}

This is the same as:

if () {} else { if() {} }

I guess, that it is not what you want to use, the correct construction should be:

if () {} elseif() {}

The code itself can be rewritten like this:

function message($content, $class = ''){
    return str_repeat(' ', 20) . '$content\n";
}

if (!Input::exists()){
    echo message('We will address you by this name.', 'addition');
    echo message('Re-enter your email to make sure it\'s correct.', 'addition');
} elseif (Input::exists() && $token) {
    if($validation->error('firstname') && $validation->error('lastname')) {
        echo message('You did not enter your name.', 'addition error');
    } elseif($validation->error('firstname')) {
        echo message('You did not enter your first name', 'addition error');
    } else {
        echo message('You did not enter your last name.', 'addition error');
    }

    if($validation->error('emailConfirm') == 'match') {
        echo message('The email address you entered does not match.', 'addition error');
    } elseif($validation->error('emailConfirm') == 'type') {
        echo message('You did not re-enter a valid email address.', 'addition error');
    } else {
        echo message('You did not re-enter your email to confirm', 'addition error');
    }
}

StackExchange Code Review Q#47636, answer score: 6