json_encode JSON_UNESCAPED_SLASHES无法正常工作，并且仍在转义斜线 [英] json_encode JSON_UNESCAPED_SLASHES not working and still escaping slashes

问题描述

我的自动完成搜索功能被破坏，因为带有重音符号的字符存储在mySQL中。

My autocomplete search feature is broken because of how characters with accents are stored in the mySQL.

例如，在mySQL列中，É的存储方式类似于\ u00c9

For example, in the mySQL column, É is stored like \u00c9

在接收用户输入并调用mySQL的PHP​​中，É是\xc3\x89

In the PHP, which receives the user's input and calls on mySQL, É is \xc3\x89

json_encode（）几乎可以完美地将 \xc3\x89转换为 \u00c9

json_encode() almost works perfectly to take "\xc3\x89" and convert it to "\u00c9"

$clean = json_encode($criteria, JSON_UNESCAPED_SLASHES);

除非将其转换为 \\u00c9，所以字符甚至都不匹配

Except it converts it to "\\u00c9" and so the characters don't match even though they are both É.

选项JSON_UNESCAPED_SLASHES不起作用。为什么不能不将另一个反斜杠添加到反斜杠前面？

The option JSON_UNESCAPED_SLASHES isn't working. Why does it not keep another backslash from being added in front of the backslash?

我如何使它起作用？

编辑：我刚刚在下面添加了实际的代码和错误日志输出。代码：

I just added the actual code and error log output below. code:

error_log("criteria vvvvvvvvvvvvv");
error_log($criteria);

$clean = json_encode($criteria, JSON_UNESCAPED_SLASHES);  

error_log("json_encode(criteria) vvvvvvvvvvvvvv");
error_log($clean);

错误日志：

[Fri Aug 23] criteria vvvvvvvvvvvvvvv, 
[Fri Aug 23 \xc3\x89
[Fri Aug 23] json_encode(criteria) vvvvvvvvvvvvvvv, 
[Fri Aug 23] "\\u00c9"

推荐答案

第一个 JSON_UNESCAPED_SLASHES 用于防止转义顾名思义， SLASHES / 不要指望它会阻止 back 斜线 \

First JSON_UNESCAPED_SLASHES is used to prevent escaping "SLASHES" / as the name implies, don't expect it to prevent escaping backslashes \

echo json_encode('/'); // prints "\/"
echo json_encode('/', JSON_UNESCAPED_SLASHES); // prints "/"
echo json_encode("\\", JSON_UNESCAPED_SLASHES); // prints "\\"
//note on line 3 : the input is 1 backslash

如您所见，它只能防止转义斜杠，而不是反斜杠

As you can see it prevents escaping slashes only , not backslashes

关于您的问题，如果最终使用 json_encode 与类似 \\u00c9 的东西一样，那么您必须将此字符串作为输入 \u00c9 ， json_encode（）没做错什么，用字符串 \u00c9而不是Unicode字符 00c9 并且它在字符串开头转义了反斜杠。

Regarding your problem, if you ended up by using json_encode with something like \\u00c9 then you must have gave it this string as input \u00c9 , json_encode() did nothing wrong , you feed it with the string "\u00c9" not the Unicode character00c9 and it escaped the backslash at the string beginning.

您的 $ criteria 变量可能包含JSON编码的字符串，例如 \u00c9 已在不使用 JSON_UNESCAPED_UNICODE 选项，换句话说，不要两次使用 json_encode（）。

Your $criteria variable is probably holding a JSON encoded string like "\u00c9" that has been encoded without using the JSON_UNESCAPED_UNICODE option, in other words don't use json_encode() twice.

检查这些示例，可能会清除

check these examples, it could clear things out

echo json_encode("É", JSON_UNESCAPED_SLASHES) . "\n";
echo json_encode("\u00c9", JSON_UNESCAPED_SLASHES) . "\n";
echo json_encode("\xc3\x89", JSON_UNESCAPED_SLASHES) . "\n";
echo json_encode("/") . "\n";
echo json_encode("/", JSON_UNESCAPED_SLASHES) . "\n";
echo json_encode("\\", JSON_UNESCAPED_SLASHES) . "\n";

此输出

"\u00c9"
"\\u00c9"
"\u00c9"
"\/"
"/"
"\\"

实时演示

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