在PHP json_decode()中检测到错误的json数据? [英] Detect bad json data in PHP json_decode()?
问题描述
通过json_decode()解析时,我正在尝试处理错误的json数据.我正在使用以下脚本:
I'm trying handle bad json data when parsed through json_decode(). I'm using the following script:
if(!json_decode($_POST)) {
echo "bad json data!";
exit;
}
如果$ _POST等于:
If $_POST equals:
'{ bar: "baz" }'
然后json_decode可以正确处理错误并吐出错误的json数据!"; 但是,如果我将$ _POST设置为无效数据"之类的东西,它将给我:
Then json_decode handles the error fine and spits out "bad json data!"; However, if I set $_POST to something like "invalid data", it gives me:
Warning: json_decode() expects parameter 1 to be string, array given in C:\server\www\myserver.dev\public_html\rivrUI\public_home\index.php on line 6
bad json data!
我是否需要编写一个自定义脚本来检测有效的json数据,还是有其他一些漂亮的方法来检测到此数据?
Do I need to write a custom script to detect valid json data, or is there some other nifty way to detect this?
推荐答案
关于 json_decode
:
- 它返回数据,或者在出现错误时返回
null
- 它也可以在没有错误的情况下返回
null
:当JSON字符串包含null
时
- 它会在有警告的地方发出警告-您要使其消失的警告.
- it returns the data, or
null
when there is an error - it can also return
null
when there is no error : when the JSON string containsnull
- it raises a warning where there is a warning -- warning that you want to make disappear.
为了解决警告问题,一种解决方案是使用 @
运算符 (我通常不建议使用它,因为它会使调试更加困难...但是在这里,没有太多选择):
To solve the warning problem, a solution would be to use the @
operator (I don't often recommend using it, as it makes debuging a lot more harder... But here, there is not much of a choice) :
$_POST = array(
'bad data'
);
$data = @json_decode($_POST);
然后,您必须测试$data
是否为null
,并且,为避免json_decode
在JSON字符串中为null
返回null
的情况,可以检查 json_last_error
,其中(引用):
You'd then have to test if $data
is null
-- and, to avoid the case in which json_decode
returns null
for null
in the JSON string, you could check json_last_error
, which (quoting) :
返回上一个错误(如果有) 发生在上一次JSON解析中.
Returns the last error (if any) occurred by last JSON parsing.
这意味着您必须使用如下代码:
Which means you'd have to use some code like the following :
if ($data === null
&& json_last_error() !== JSON_ERROR_NONE) {
echo "incorrect data";
}
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