HaxeFoundation.haxe/std/php/_polyfills.php

<?php
/**
 * Polyfills for some functions, which are required by Haxe-generated code, but not available in PHP 7.0.
 * No Haxe-generated code is available at this point.
 * No code should be executed from this file.
 * Symbols declarations are the only code allowed here.
 */
namespace { //Namespace declaration is required because this file is included under non-root namespace.

}