vendor/phpunit/phpunit/src/Util/XML.php

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<?php
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * XML helpers.
 *
 * @since Class available since Release 3.2.0
 */
class PHPUnit_Util_XML
{
    /**
     * Escapes a string for the use in XML documents
     * Any Unicode character is allowed, excluding the surrogate blocks, FFFE,
     * and FFFF (not even as character reference).
     * See http://www.w3.org/TR/xml/#charsets
     *
     * @param string $string
     *
     * @return string
     *
     * @since  Method available since Release 3.4.6
     */
    public static function prepareString($string)
    {
        return preg_replace(
            '/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]/',
            '',
            htmlspecialchars(
                PHPUnit_Util_String::convertToUtf8($string),
                ENT_QUOTES,
                'UTF-8'
            )
        );
    }

    /**
     * Loads an XML (or HTML) file into a DOMDocument object.
     *
     * @param string $filename
     * @param bool   $isHtml
     * @param bool   $xinclude
     * @param bool   $strict
     *
     * @return DOMDocument
     *
     * @since  Method available since Release 3.3.0
     */
    public static function loadFile($filename, $isHtml = false, $xinclude = false, $strict = false)
    {
        $reporting = error_reporting(0);
        $contents  = file_get_contents($filename);
        error_reporting($reporting);