Manage JSON_THROW_ON_ERROR conflict

[etienneroudeix]

Hi,

Consider the following code using the standard json_decode PHP function

\json_decode('"incorrect json');
echo 'Error : ' . json_last_error() . PHP_EOL;
\json_decode('"correct json agin"');
echo 'Error : ' . json_last_error() . PHP_EOL;

It has the expected behavior.

Error : 3
Error : 0

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Now have a look at this the following code using the standard json_decode PHP function

\json_decode('"incorrect json');
echo 'Error : ' . json_last_error() . PHP_EOL;
\json_decode('"correct json"', false, 512, JSON_THROW_ON_ERROR);
echo 'Error : ' . json_last_error() . PHP_EOL;

It has comes to a weird behavior.

Error : 3
Error : 3

---

Due to the above, the Safe\json_decode function has this bug :

try {
    json_decode('"incorrect json');
} catch (\Exception $e) {
    echo 'Error : ' . json_last_error() . PHP_EOL;
}
json_decode('"correct json"', false, 512, JSON_THROW_ON_ERROR);

This is throwing because of json_last_error() not being updated when using JSON_THROW_ON_ERROR.

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For the record I found this bug because of a vendor using standard json_decode and then me calling safe version with JSON_THROW_ON_ERROR.