PHP：An invalid XML character (Unicode: 0xc) was found

Question

解決したいこと

PHPで以下エラーを解決したい。
An invalid XML character (Unicode: 0xc) was found

##背景

Ebayに一括出品ツール開発を行っております。
一括出品はオークタウンfor Ebayを利用しています。

投稿する説明文をHTMLで組み立てることができるため、PHP内で固定文言を組み立てました。
それをオークタウンfor Ebayにアップロードすると、以下エラーが表示されました。

5-XML Error Text: "; nested exception is: org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0xc) was found in the element content of the document.".

##調べたこと

検索して、以下の回答にたどり着きました。
https://stackoverflow.com/questions/5742543/an-invalid-xml-character-unicode-0xc-was-found

上記ベストアンサーを引用します。

There are a few characters that are dissallowed in XML documents, even when you encapsulate data in CDATA-blocks.

If you generated the document you will need to entity encode it or strip it out. If you have an errorneous document, you should strip away these characters before trying to parse it.

HTML内に無効なXMLがあり、それを取り除く必要があります。

PHPではそれをどのようにしたら実現できるのでしょうか？
##環境
PHP7

コード

「投稿する説明文をHTMLで組み立てることができるため、PHP内で固定文言を組み立てました。」
上記の補足です。

PHPのヒアドキュメントで以下の文字列を作りました。
そして、このHTMLに対して掲題のエラーとなりました。

<meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/css?family=Roboto+Condensed:300" rel="stylesheet" />
<link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<style type="text/css">h1,h2,h3{font-family: 'Roboto Condensed', sans-serif;}
p,ul,li,ol{font-family: 'Open Sans', sans-serif;text-align: left;}
h1,h2,h3,p,ul,li,ol{color: #333;}

h1{
padding-left:1em;
}
h2,h3{
background: linear-gradient(transparent 70%, #a7d6ff 70%);
text-shadow: 1px 1px 1px rgba(255, 255, 255, 0.5);
font-size:95%;
padding:0.3em 1em;
margin:10px 20px;
margin-top:2em;
}

h3:before {color: #555;font-size:.8em;margin-right:10px;font-family:"FontAwesome";}

.shiharai h3:before {content:"1ed";}
.hasso h3:before {content:"0d1";}
.torihiki h3:before {content:"27b";}
.tyuui h3:before {content:"071";}

p, .product_dec div{
margin-bottom:2em;
padding:0.5em 2em;
text-align:left;
}
article{
max-width:96%;
}

.dec_img{
margin: 0 auto;
max-width: 90%;
}

.dec_img img{
max-width:100%;
}

.dec_img img:not(:first-child){
display:none;
}
@media screen and (min-width: 768px) {
article{
margin:0 auto;
max-width:65%;
text-align: center;
}
h2,h3{
font-size:125%;
}
.dec_img img:not(:first-child){
display: inherit;
}
.dec_img{
display:inline-block;
}
.dec_img img{
max-width:45%;
margin:5px;
}
}
</style>
<article>

<h1>Ukiyo-e Utagawa Hiroshige Famous View of Edo 100 Views Suidobashi Surugadai</h1>
<section class="product_dec">
<h2>Description</h2>
<div typeof="Product" vocab="https://schema.org/"><span property="description"><p> A single carp streamer that is drawn large and bold as if it covers the entire screen. </p><p> This work shines with outstanding compositional power unique to Hiroshige. </p><p></p><p> This is a view of Surugadai seen from the Hongo plateau, depicting the scenery of the day of the festival at noon. </p><p> In a house with a boy under 7 years old, the day was celebrated grandly. </p><p> Fuji clearly appears in the back of the screen, indicating that it is a refreshing day of clear May. </p><p></p><p></p><p>・ About Utagawa Hiroshige </p><p> A total of 55 Tokaido fifty-three figures published by Hoei-do during the Tempo year were a huge hit, and since then they have painted numerous landscape pictures of the Tokaido. </p><p> He left a poem-filled poem in flower and bird painting, and in his last year&#39;s work, “One Hundred Famous Views of Edo,” depicting the seasonal Edo landscape with a unique perspective and rich sensibilities. </p><p> The series is also known for being replicated by Van Gogh. </p><p></p><p></p><p>・ About 100 famous places of Edo </p><p> One of the most famous works of Edo famous for its bold composition is the world famous for its impressive masters such as Monet and Van Gogh. </p><p> Divided into four parts, spring, summer, autumn and winter, the series of works depicting the true nature of Edo that is shown in each season shows the deep attachment of Hiroshige to the town of Edo where he was born and raised. </p><p></p><p></p><p>・ Remarks </p><p> Image dimensions 33.7 × 22.0 cm </p><p> Paper Echizen seisou service book </p><p> Explanation Japanese and English </p><p> made in Japan </</span></div>
</section>
<aside>
<div class="shiharai">
<h3>Payment</h3>s
<p>We accept PayPal only.
We usually ship within 5 business days of receiving cleared payment.
Our return policy, In the only case of unopened item package.
We ships from Japan This product. Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.</p>
</div>

<div class="hasso">
<h3>Shipping</h3>

<p></p>
</div>

<div class="torihiki">
<h3>Terms of Sale</h3>

<p>We guarantee all the displayed items are authentic, and there are no pirated or illegally copied items.
Please feel reassured.</p>
</div>

<div class="tyuui">
<h3>International Buyers - Please Note:</h3>

<p>Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer&#39;s responsibility. Please check with your country&#39;s customs office to determine what these additional costs will be prior to bidding or buying.</p>
</div>
</aside>
</article>

<div id="gtx-trans" style="position: absolute; left: 515px; top: -8px;">
<div class="gtx-trans-icon">&nbsp;</div>
</div>

Comments

[m.ts10806]

まずはそのPHPのコードと組み立てた結果をご提示ください。

[m.ts10806]

外部CSSを読み込むlinkタグが使えないとかはないですか？

[takumi123]

＞外部CSSを読み込むlinkタグが使えないとかはないですか？
上記を削除して試してみましたが結果は同じでした。
ご提案ありがとうございます。

Answer 1

解決しました。

私の場合は以下コードを削除することで、エラーが出なくなりました。

.shiharai h3:before {content:"1ed";}
.hasso h3:before {content:"0d1";}
.torihiki h3:before {content:"27b";}
.tyuui h3:before {content:"071";}

解決過程としては、コードを一部ずつアップロードして異常部分を特定。
その部分を削除という力技でした。