Execute php code in shortcode content in my theme template

First of all thank you very much for this great plugin.

I’m trying to use the shortcode directly in theme template. It works to a certain point where I tried to put some php code in the content. Below an example :

<?php
    $phpcode1 = echo esc_attr($EM_Event->event_name,ENT_QUOTES);
    $my_tabs = '
    [su_tabs vertical="yes"]
    [su_tab title="Event Name"]
    <h3 class="event-form-name"></h3>
    <div class="inside event-form-name">
    <input type="text" name="event_name" id="event-name" value="' .$phpcode1. '" />
    <br />
    </div>
    [/su_tab]
    [su_tab title="Title 2"]Content 2[/su_tab]
    [su_tab title="Title 3"]Content 3[/su_tab]
    [/su_tabs]
';
echo do_shortcode( $my_tabs );
?>

I’ve tried this as well

<?php
    $my_tabs = '
    [su_tabs vertical="yes"]
    [su_tab title="Event Name"]
    <h3 class="event-form-name"></h3>
    <div class="inside event-form-name">
    <input type="text" name="event_name" id="event-name" value="<?php echo esc_attr($EM_Event->event_name,ENT_QUOTES); ?>" />
    <br />
    </div>
    [/su_tab]
    [su_tab title="Title 2"]Content 2[/su_tab]
    [su_tab title="Title 3"]Content 3[/su_tab]
    [/su_tabs]
';
echo do_shortcode( $my_tabs );
?>

None of these work. I’m not developer, so I’m struggling a bit here. And I could find any similar topic. Any help will be appreciated.

Thanks.

https://wordpress.org/plugins/shortcodes-ultimate/