diff --git a/admin/class-nginx-helper-admin.php b/admin/class-nginx-helper-admin.php
index d94d86b9..a024e318 100644
--- a/admin/class-nginx-helper-admin.php
+++ b/admin/class-nginx-helper-admin.php
@@ -679,12 +679,20 @@ public function purge_all() {
 
 		global $nginx_purger, $wp;
 
-		$method = filter_input( INPUT_SERVER, 'REQUEST_METHOD', FILTER_SANITIZE_STRING );
+		$method = null;
+		if ( isset( $_SERVER['REQUEST_METHOD'] ) ) {
+			$method = wp_strip_all_tags( $_SERVER['REQUEST_METHOD'] );
+		}
 
+		$action = '';
 		if ( 'POST' === $method ) {
-			$action = filter_input( INPUT_POST, 'nginx_helper_action', FILTER_SANITIZE_STRING );
+			if ( isset( $_POST['nginx_helper_action'] ) ) {
+				$action = wp_strip_all_tags( $_POST['nginx_helper_action'] );
+			}
 		} else {
-			$action = filter_input( INPUT_GET, 'nginx_helper_action', FILTER_SANITIZE_STRING );
+			if ( isset( $_GET['nginx_helper_action'] ) ) {
+				$action = wp_strip_all_tags( $_GET['nginx_helper_action'] );
+			}
 		}
 
 		if ( empty( $action ) ) {
@@ -725,12 +733,12 @@ public function purge_all() {
 
 		if ( 'purge' === $action ) {
 	
-		    /**
-		     * Fire an action after the entire cache has been purged whatever caching type is used.
-		     * 
-		     * @since 2.2.2
-		     */
-		    do_action( 'rt_nginx_helper_after_purge_all' );
+			/**
+			 * Fire an action after the entire cache has been purged whatever caching type is used.
+			 * 
+			 * @since 2.2.2
+			 */
+			do_action( 'rt_nginx_helper_after_purge_all' );
 
 		}
 
diff --git a/admin/partials/nginx-helper-admin-display.php b/admin/partials/nginx-helper-admin-display.php
index 175e3ed1..bd153714 100644
--- a/admin/partials/nginx-helper-admin-display.php
+++ b/admin/partials/nginx-helper-admin-display.php
@@ -25,7 +25,7 @@
 			<div id="post-body-content">
 				<?php
 				/* Show settinhs tabs */
-				$current_tab         = filter_input( INPUT_GET, 'tab', FILTER_SANITIZE_STRING );
+				$current_tab         = ( isset( $_GET['tab'] ) ? wp_strip_all_tags( $_GET['tab'] ) : '' );
 				$current_setting_tab = ( ! empty( $current_tab ) ) ? $current_tab : 'general';
 
 				echo '<h2 class="nav-tab-wrapper">';
diff --git a/admin/partials/nginx-helper-general-options.php b/admin/partials/nginx-helper-general-options.php
index 0dc388a4..87f2e32d 100644
--- a/admin/partials/nginx-helper-general-options.php
+++ b/admin/partials/nginx-helper-general-options.php
@@ -15,33 +15,39 @@
 $error_log_filesize = false;
 
 $args = array(
-	'enable_purge'                     => FILTER_SANITIZE_STRING,
-	'enable_stamp'                     => FILTER_SANITIZE_STRING,
-	'purge_method'                     => FILTER_SANITIZE_STRING,
-	'is_submit'                        => FILTER_SANITIZE_STRING,
-	'redis_hostname'                   => FILTER_SANITIZE_STRING,
-	'redis_port'                       => FILTER_SANITIZE_STRING,
-	'redis_prefix'                     => FILTER_SANITIZE_STRING,
-	'purge_homepage_on_edit'           => FILTER_SANITIZE_STRING,
-	'purge_homepage_on_del'            => FILTER_SANITIZE_STRING,
-	'purge_url'                        => FILTER_SANITIZE_STRING,
-	'log_level'                        => FILTER_SANITIZE_STRING,
-	'log_filesize'                     => FILTER_SANITIZE_STRING,
-	'smart_http_expire_save'           => FILTER_SANITIZE_STRING,
-	'cache_method'                     => FILTER_SANITIZE_STRING,
-	'enable_map'                       => FILTER_SANITIZE_STRING,
-	'enable_log'                       => FILTER_SANITIZE_STRING,
-	'purge_archive_on_edit'            => FILTER_SANITIZE_STRING,
-	'purge_archive_on_del'             => FILTER_SANITIZE_STRING,
-	'purge_archive_on_new_comment'     => FILTER_SANITIZE_STRING,
-	'purge_archive_on_deleted_comment' => FILTER_SANITIZE_STRING,
-	'purge_page_on_mod'                => FILTER_SANITIZE_STRING,
-	'purge_page_on_new_comment'        => FILTER_SANITIZE_STRING,
-	'purge_page_on_deleted_comment'    => FILTER_SANITIZE_STRING,
-	'smart_http_expire_form_nonce'     => FILTER_SANITIZE_STRING,
+	'enable_purge',
+	'enable_stamp',
+	'purge_method',
+	'is_submit',
+	'redis_hostname',
+	'redis_port',
+	'redis_prefix',
+	'purge_homepage_on_edit',
+	'purge_homepage_on_del',
+	'purge_url',
+	'log_level',
+	'log_filesize',
+	'smart_http_expire_save',
+	'cache_method',
+	'enable_map',
+	'enable_log',
+	'purge_archive_on_edit',
+	'purge_archive_on_del',
+	'purge_archive_on_new_comment',
+	'purge_archive_on_deleted_comment',
+	'purge_page_on_mod',
+	'purge_page_on_new_comment',
+	'purge_page_on_deleted_comment',
+	'smart_http_expire_form_nonce',
 );
 
-$all_inputs = filter_input_array( INPUT_POST, $args );
+$all_inputs = array();
+
+foreach ( $args as $val ) {
+	if ( isset( $_POST[ $val ] ) ) {
+		$all_inputs[ $val ] = wp_strip_all_tags( $_POST[ $val ] );
+	}
+}
 
 if ( isset( $all_inputs['smart_http_expire_save'] ) && wp_verify_nonce( $all_inputs['smart_http_expire_form_nonce'], 'smart-http-expire-form-nonce' ) ) {
 	unset( $all_inputs['smart_http_expire_save'] );
@@ -720,7 +726,7 @@
 			</table>
 		</div> <!-- End of .inside -->
 	</div>
-    <input type="hidden" name="smart_http_expire_form_nonce" value="<?php echo wp_create_nonce('smart-http-expire-form-nonce'); ?>"/>
+	<input type="hidden" name="smart_http_expire_form_nonce" value="<?php echo esc_attr( wp_create_nonce( 'smart-http-expire-form-nonce' ) ); ?>" />
 	<?php
 		submit_button( __( 'Save All Changes', 'nginx-helper' ), 'primary large', 'smart_http_expire_save', true );
 	?>