关于\u003c转换成正常html符号的事

这两天，在用php写一个爬虫。
对方的代码都在JS中，表现形式为ASCII编码。如下图示：

"\u003cdiv class=\"grid-container footer-container\"\u003e\n  \u003cdiv class=\"grid footer\"\u003e\n    \u003cdiv class=\"grid__item md--one-quarter\"\u003e\n      \u003cp class=\"footer__title\"\u003eSupport\u003c/p\u003e\n      \u003cul class=\"footer__nav\"\u003e\n        \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/about\"\u003e\u003c/a\u003e\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/contact\"\u003eContact us\u003c/a\u003e\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/cookies\"\u003eCookie Policy\u003c/a\u003e\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/terms\"\u003eTerms of use\u003c/a\u003e\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/privacy\"\u003ePrivacy Policy\u003c/a\u003e\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/ub/refunds\"\u003eReturns Policy\u003c/a\u003e\u003c/li\u003e\n      \u003c/ul\u003e\n      \u003cp class=\"footer__title\"\u003eSafe and Secure\u003c/p\u003e\n      \u003cimg class=\"footer__ssl\" src=\"/themes/compare-modular/images/v2/ssl-secured.svg\" alt=\"\"\u003e\n    \u003c/div\u003e\n    \u003cdiv class=\"grid__item md--one-half\"\u003e\n      \u003cp class=\"footer__title\"\u003eShop\u003c/p\u003e\n      \u003cul class=\"footer__nav footer__nav--categories\"\u003e\n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=Home\u0026#43;Furniture\u0026#43;DIY\"\u003eHome, Furniture \u0026amp; DIY\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=Garden\u0026#43;Patio\"\u003eGarden \u0026amp; Patio\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=TV\u0026#43;Speakers\"\u003eSound \u0026amp; Vision\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=sports\u0026#43;equipment\"\u003eSports Goods\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=makeup\u0026#43;skincare\"\u003eHealth \u0026amp; Beauty\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=cars\u0026#43;motorcycles\"\u003eCars, Motorcycles \u0026amp; Vehicles\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=jewellery\u0026#43;watches\"\u003eJewellery \u0026amp; Watches\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?=mobile\u0026#43;phones\"\u003eSmartphones\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=Toys\u0026#43;Games\"\u003eToys \u0026amp; Games\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=baby\"\u003eBaby\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=child\u0026#43;clothes\"\u003eKids Clothes \u0026amp; Shoes\u003c/a\u003e\u003c/li\u003e\n          \n        \n          \n            \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"/search?q=clothing\u0026#43;accessories\"\u003eClothing \u0026amp; Accessories\u003c/a\u003e\u003c/li\u003e\n          \n        \n      \u003c/ul\u003e\n    \u003c/div\u003e\n    \u003cdiv class=\"grid__item md--one-quarter\"\u003e\n      \u003cp class=\"footer__title\"\u003eOur Address\u003c/p\u003e\n      \u003cul class=\"footer__nav\"\u003e\n        \u003cli class=\"footer__nav__item\"\u003e\u003ca href=\"https://www.redbrain.com/\"\u003eRedBrain\u003c/a\u003e\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003eSuite 14, Cathedral House\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003e5 Beacon Street\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003eLichfield\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003eStaffordshire\u003c/li\u003e\n        \u003cli class=\"footer__nav__item\"\u003eWS13 7AA\u003c/li\u003e\n      \u003c/ul\u003e\n    \u003c/div\u003e\n  \u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class=\"grid-container footer-container footer-container--2\"\u003e\n  \u003cdiv class=\"grid\"\u003e\n    \u003cdiv class=\"grid__item\"\u003e\n      \u003cdiv class=\"footer footer--2\"\u003e\n        \u003ca class=\"footer--2__link\" href=\"/\"\u003e\u003cimg class=\"footer--2__logo\" src=\"/images/logo.svg\" alt=\"\"\u003e\u003c/a\u003e\n        \u003cp\u003e© RedBrain 2018\u003c/p\u003e\n      \u003c/div\u003e\n    \u003c/div\u003e\n  \u003c/div\u003e\n\u003c/div\u003e\n\n\n\n 

怎么转啊？
找啊找啊，找朋友。找到一个小方法。

$str = preg_replace("/\\\\u([0-9a-f]{3,4})/i", "&#x\\1;", $str);
$str = html_entity_decode($str, null, 'UTF-8');

转换后效果为

<div class="grid-container footer-container">
  <div class="grid footer">
    <div class="grid__item md--one-quarter">
      <p class="footer__title">Support</p>
      <ul class="footer__nav">
        <li class="footer__nav__item"><a href="/about"></a></li>
        <li class="footer__nav__item"><a href="/contact">Contact us</a></li>
        <li class="footer__nav__item"><a href="/cookies">Cookie Policy</a></li>
        <li class="footer__nav__item"><a href="/terms">Terms of use</a></li>
        <li class="footer__nav__item"><a href="/privacy">Privacy Policy</a></li>
        <li class="footer__nav__item"><a href="/ub/refunds">Returns Policy</a></li>
      </ul>
      <p class="footer__title">Safe and Secure</p>
      <img class="footer__ssl" src="/themes/compare-modular/images/v2/ssl-secured.svg" alt="">
    </div>
    <div class="grid__item md--one-half">
      <p class="footer__title">Shop</p>
      <ul class="footer__nav footer__nav--categories">


            <li class="footer__nav__item"><a href="/search?q=Home&#43;Furniture&#43;DIY">Home, Furniture &amp; DIY</a></li>



            <li class="footer__nav__item"><a href="/search?q=Garden&#43;Patio">Garden &amp; Patio</a></li>



            <li class="footer__nav__item"><a href="/search?q=TV&#43;Speakers">Sound &amp; Vision</a></li>



            <li class="footer__nav__item"><a href="/search?q=sports&#43;equipment">Sports Goods</a></li>



            <li class="footer__nav__item"><a href="/search?q=makeup&#43;skincare">Health &amp; Beauty</a></li>



            <li class="footer__nav__item"><a href="/search?q=cars&#43;motorcycles">Cars, Motorcycles &amp; Vehicles</a></li>



            <li class="footer__nav__item"><a href="/search?q=jewellery&#43;watches">Jewellery &amp; Watches</a></li>



            <li class="footer__nav__item"><a href="/search?=mobile&#43;phones">Smartphones</a></li>



            <li class="footer__nav__item"><a href="/search?q=Toys&#43;Games">Toys &amp; Games</a></li>



            <li class="footer__nav__item"><a href="/search?q=baby">Baby</a></li>



            <li class="footer__nav__item"><a href="/search?q=child&#43;clothes">Kids Clothes &amp; Shoes</a></li>



            <li class="footer__nav__item"><a href="/search?q=clothing&#43;accessories">Clothing &amp; Accessories</a></li>


      </ul>
    </div>
    <div class="grid__item md--one-quarter">
      <p class="footer__title">Our Address</p>
      <ul class="footer__nav">
        <li class="footer__nav__item"><a href="https://www.redbrain.com/">RedBrain</a></li>
        <li class="footer__nav__item">Suite 14, Cathedral House</li>
        <li class="footer__nav__item">5 Beacon Street</li>
        <li class="footer__nav__item">Lichfield</li>
        <li class="footer__nav__item">Staffordshire</li>
        <li class="footer__nav__item">WS13 7AA</li>
      </ul>
    </div>
  </div>
</div>
<div class="grid-container footer-container footer-container--2">
  <div class="grid">
    <div class="grid__item">
      <div class="footer footer--2">
        <a class="footer--2__link" href="/"><img class="footer--2__logo" src="/images/logo.svg" alt=""></a>
        <p>© RedBrain 2018</p>
      </div>
    </div>
  </div>
</div>

好啦，搞定了。