Take input from form and pass it to function using a wp-plugin

Edit: I have fixed my original issue, please skip to the body for my last remaining issue.

I need to make a plugin. That displays an input field to the user, takes that input field data and passess it to a php function, and then reloads that page and displays what ever the user has typed in.

What I have in my plugin file

     function testytest($val1,$val2)
{
        return $val1;
}

    function awepop_add_view() {

           $idPageToTest = 55;


            if (    isset($GLOBALS["post"])
                  ($GLOBALS["post"]-ID === $idPageToTest)
            ) {
        echo 'div class="row"div class="col-md-6 col-md-offset-3"div class="alert alert-success" role="alert"p style="text-align: center;"

form action="" method="get"
    Host Name:
    input type="text" name="val1" id="val1"/input


    br/br
    or
    br/br
    Ip Address:
    input type="text" name="val2" id="val2"/input

    br/br

    input type="submit" name="submit" value="send"/input
/form

/p/div/div/div';}
    }
    add_filter( 'the_content', 'awepop_add_view', 20 );
    #add_action("wp_head", "awepop_add_view");
    ?

For what ever reason if I add php code to my echo my site hangs with a 500 error until I remove it. It doesn't matter if I put the code above or below my form.

and the code is this

?php
if( isset($_GET['submit']) )
{
    //be sure to validate and clean your variables
    $val1 = htmlentities($_GET['val1']);
    $val2 = htmlentities($_GET['val2']);

    //then you can use them in a PHP function. 
    $result = testytest($val1, $val2);
    echo '$result';

}
?

I got it from https://stackoverflow.com/questions/15055115/how-to-pass-form-input-value-to-php-function

I do devops not web stuff Sorry =)

Edit: Now when I hit submit it sends me to my sites homepage, it doesn't reload the page I am on with the users input displayed.