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wp-content/plugins/webp-express/lib/classes/BiggerThanSource.php

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+<?php
+
+/*
+This class is made to not be dependent on Wordpress functions and must be kept like that.
+It is used by webp-on-demand.php. It is also used for bulk conversion.
+*/
+namespace WebPExpress;
+
+
+class BiggerThanSource
+{
+    /**
+     * Check if webp is bigger than original.
+     *
+     * @return boolean|null   True if it is bigger than original, false if not. NULL if it cannot be determined
+     */
+    public static function bigger($source, $destination)
+    {
+        if ((!@file_exists($source)) || (!@file_exists($destination))) {
+            return null;
+        }
+        $filesizeDestination = @filesize($destination);
+        $filesizeSource = @filesize($source);
+
+        // sizes are FALSE on failure (ie if file does not exists)
+        if (($filesizeSource === false) || ($filesizeDestination === false)) {
+            return null;
+        }
+
+        return ($filesizeDestination > $filesizeSource);
+    }
+}