og:description'content'未终止的字符串文字 [英] og:description 'content' unterminated string literal

问题描述

可能重复:
未终止的字符串文字

Possible Duplicate:
unterminated string literal

我在设置og:description时遇到问题，其功能如下...

I have a problem setting og:description with followed function...

function createFacebookMeta($title, $fcUrl, $fcImg, $fcDesc){    
    $fcDesc = (strlen($fcDesc) > 100) ? substr($fcDesc,0,150).'...' : $fcDesc;
    $faceBook = "<script type=\"text/javascript\">


$(document).attr('title', '".$title."');
$('meta[property=\"og:title\"]').attr('content', '".$title."');
$('meta[property=\"og:url\"]').attr('content', '".$fcUrl."');
$('meta[property=\"og:image\"]').attr('content', '".$fcImg."');
$('meta[property=\"og:description\"]').attr('content', '".$fcDesc."');
FB.XFBML.parse();
</script>";
echo $faceBook;
}

作为回应，我进入了萤火虫

as response i get in firebug

未终止的字符串文字

 $('meta[property="og:description"]').attr('content', 'Logos gedruckt<br />  //breaks here

即使我使用剥离标签，它也会报告相同的内容...如果我未设置og:description，则会采用默认元描述(此处为np)，长度大致相同，因为我读到fb从中获取了大约300个字符最大

even if i use striptags it reports same ... if i don´t set og:description default meta description is taken (np here) which is about the same lenght, as i read that fb takes arround 300 chars from it max

谢谢

$ fcDesc是数据库结果

$fcDesc is db result

$fcDesc = "Logos gedruckt
<br>
100% Baumwolle
<br>
Vorne: Logo
<br>
Rücken: Cash Ruls";

(产品描述)

推荐答案

您将以破坏代码的方式将字符串输出到javascript代码中.

You are outputting strings into javascript code in a way that it breaks the code.

发生这种情况是因为您没有正确编码javascript的PHP值.

That happens because you do not properly encode the PHP values for javascript.

一种简单的方法是使用 json_encode() 函数:

An easy way to do that is to use the json_encode() function:

$faceBook = '<script type="text/javascript">
$(document).attr(\'title\', ' . json_encode($title) . '); ....';

在需要为javascript编码PHP变量的值时使用它. JSON是javascript的子集，因此效果很好.

Use it whenever you need to encode the value of a PHP variable for javascript. JSON is a subset of javascript so this works really well.

另外，您可能希望简化描述字符串:

Additionally you might want to simplify the description string:

$simplified = preg_replace('/\s+/', ' ', strip_tags($fcDesc));

这确实删除了其中的HTML <br>标记，然后对空格进行了规范化.

This does remove the HTML <br> tags you have in there and then normalizing whitespaces.

还让我们看看json_encode的作用:

echo json_encode($simplified), "\n";

输出:

"Logos gedruckt 100% Baumwolle Vorne: Logo R\u00fccken: Cash Ruls"

如您所见，json_encode不仅要注意添加引号，而且还要将字符串中的字符正确编码为unicode序列.

As you can see, json_encode takes not only care of adding the quotes but to also properly encode characters in the string into unicode sequences.

在原始字符串中，您有换行符.在javascript中，字符串中不能包含换行符(可以在PHP中，但不能在javascript中).在原始字符串上使用json_encode也可以解决该问题:

In your original string you had line-breaks. In javascript you can not have line-breaks in string (you can have in PHP, but not in javascript). Using json_encode on your original string does fix that, too:

"Logos gedruckt\n<br>\n100% Baumwolle\n<br>\nVorne: Logo\n<br>\nR\u00fccken: Cash Ruls"

如您所见，换行符在输出中正确地写为\n.只要记住json_encode，将它用于所有放入javascript标记的变量即可.这将使您的代码稳定.

As you can see, the line-breaks are correctly written as \n in the output. Just remember json_encode, use it for all your variables you put into the javascript tag. That will make your code stable.

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