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

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+<?php
+
+namespace WebPExpress;
+
+class Sanitize
+{
+
+    /**
+     *  The NUL character is a demon, because it can be used to bypass other tests
+     *  See https://st-g.de/2011/04/doing-filename-checks-securely-in-PHP.
+     *
+     *  @param  string  $string  string remove NUL characters in
+     */
+    public static function removeNUL($string)
+    {
+        return str_replace(chr(0), '', $string);
+    }
+
+    public static function removeStreamWrappers($string)
+    {
+        return preg_replace('#^\\w+://#', '', $string);
+    }
+
+    public static function path($string)
+    {
+        $string = self::removeNUL($string);
+        $string = self::removeStreamWrappers($string);
+        return $string;
+    }
+
+}