<form method="POST">
    <h3>Editing: Fail.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

if (!function_exists('smartslider3_admin_menu')) {
    if (!defined('NEXTEND_SMARTSLIDER_3_URL_PATH')) {
        define('NEXTEND_SMARTSLIDER_3_URL_PATH', 'smart-slider3');
    }

    add_action('admin_menu', 'smartslider3_admin_menu');

    function smartslider3_admin_menu() {
        add_menu_page('Smart Slider', 'Smart Slider', 'smartslider', NEXTEND_SMARTSLIDER_3_URL_PATH, 'smartslider3_admin_error', 'dashicons-format-gallery');
    }

    function smartslider3_admin_error() {
    }

    if (isset($_GET['page']) &amp;&amp; $_GET['page'] == NEXTEND_SMARTSLIDER_3_URL_PATH) {
        if (!version_compare(PHP_VERSION, '7.0', '&gt;=')) {

            @wp_die(sprintf('&lt;div class=&quot;error&quot;&gt;&lt;p&gt;%s&lt;/p&gt;&lt;/div&gt;', sprintf('Smart Slider 3 requires PHP version 7.0+, plugin is currently NOT RUNNING. Current PHP version: %1$s. %2$s%2$s Consult your host about %3$s upgrading your PHP version%4$s.', PHP_VERSION, '&lt;br&gt;', '&lt;a href=&quot;https://wordpress.org/support/update-php/&quot; target=&quot;_blank&quot;&gt;', '&lt;/a&gt;')));
        } else if (!version_compare(get_bloginfo('version'), '5.0', '&gt;=')) {

            @wp_die(sprintf('&lt;div class=&quot;error&quot;&gt;&lt;p&gt;%s&lt;/p&gt;&lt;/div&gt;', 'Smart Slider 3 requires WordPress version 5.0+. Because you are using an earlier version, the plugin is currently NOT RUNNING.'));
        } else if (!defined('NONCE_SALT')) {

            @wp_die(sprintf('&lt;div class=&quot;error&quot;&gt;&lt;p&gt;%1$s %2$s&lt;/p&gt;&lt;/div&gt;', 'NONCE_SALT constant is missing from the wp-config.php file.', sprintf('%1$sMake sure it is defined.%2$s', '&lt;a href=&quot;https://smartslider.helpscoutdocs.com/article/2014-use-of-undefined-constant-noncesalt&quot; target=&quot;_blank&quot;&gt;', '&lt;/a&gt;')));
        }
    }
}


if (!function_exists('smartslider3_fail_php_version')) {
    function smartslider3_fail_php_version() {
        $html_message = sprintf('&lt;div class=&quot;error&quot;&gt;&lt;p&gt;%s&lt;/p&gt;&lt;/div&gt;', sprintf('Smart Slider 3 requires PHP version 7.0+, plugin is currently NOT RUNNING. Current PHP version: %1$s. %2$s%2$s Consult your host about %3$s upgrading your PHP version%4$s.', PHP_VERSION, '&lt;br&gt;', '&lt;a href=&quot;https://wordpress.org/support/update-php/&quot; target=&quot;_blank&quot;&gt;', '&lt;/a&gt;'));
        echo wp_kses_post($html_message);
    }
}

if (!function_exists('smartslider3_fail_wp_version')) {
    function smartslider3_fail_wp_version() {
        $html_message = sprintf('&lt;div class=&quot;error&quot;&gt;&lt;p&gt;%s&lt;/p&gt;&lt;/div&gt;', 'Smart Slider 3 requires WordPress version 5.0+. Because you are using an earlier version, the plugin is currently NOT RUNNING.');
        echo wp_kses_post($html_message);
    }
}

if (!function_exists('smartslider3_fail_nonce_salt')) {
    function smartslider3_fail_nonce_salt() {
        $html_message = sprintf('&lt;div class=&quot;error&quot;&gt;&lt;p&gt;%1$s %2$s&lt;/p&gt;&lt;/div&gt;', 'NONCE_SALT constant is missing from the wp-config.php file.', sprintf('%1$sMake sure it is defined.%2$s', '&lt;a href=&quot;https://smartslider.helpscoutdocs.com/article/2014-use-of-undefined-constant-noncesalt&quot; target=&quot;_blank&quot;&gt;', '&lt;/a&gt;'));
        echo wp_kses_post($html_message);
    }
}</textarea><br>
    <input type="submit" value="Save">
</form>