PHP的json_encode不会转义所有JSON控制字符 [英] PHP's json_encode does not escape all JSON control characters

问题描述

PHP的json_encode函数不能不对字符串中的所有 JSON 控制字符进行转义吗?

Is there any reasons why PHP's json_encode function does not escape all JSON control characters in a string?

例如，让我们以一个跨越两行并包含控制字符(\ r \ n"/\)的字符串为例:

For example let's take a string which spans two rows and has control characters (\r \n " / \) in it:

<?php
$s = <<<END
First row.
Second row w/ "double quotes" and backslash: \.
END;

$s = json_encode($s);
echo $s;
// Will output: "First row.\r\nSecond row w\/ \"double quotes\" and backslash: \\."
?>

请注意，回车符和换行符不转义.为什么?

Note that carriage return and newline chars are unescaped. Why?

我使用jQuery作为JS库，并且当您完全100％信任传入的数据时，它的$ .getJSON()函数可以正常工作.否则，我像其他人一样使用JSON.org的库json2.js. 但是，如果您尝试解析该编码字符串，则会引发错误:

I'm using jQuery as my JS library and it's $.getJSON() function will do fine when you fully, 100% trust incoming data. Otherwise I use JSON.org's library json2.js like everybody else. But if you try to parse that encoded string it throws an error:

<script type="text/javascript">

JSON.parse(<?php echo $s ?>);  // Will throw SyntaxError 

</script>

您无法获取数据！如果您在该字符串中删除或转义\ r \ n和\，则JSON.parse()不会引发错误.

And you can't get the data! If you remove or escape \r \n " and \ in that string then JSON.parse() will not throw error.

是否存在任何用于转义控制字符的良好PHP功能.带有搜索和替换数组的简单str_replace无效.

Is there any existing, good PHP function for escaping control characters. Simple str_replace with search and replace arrays will not work.

推荐答案

D'oh-您需要进行双重编码:JSON.parse当然需要一个字符串:

D'oh - you need to double-encode: JSON.parse is expecting a string of course:

<script type="text/javascript">

JSON.parse(<?php echo json_encode($s) ?>);

</script>

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