Why Am I Getting Unexpected Backslashes in My JSON Output with json_encode?

Unexpected Backslashes in JSON Output with json_encode

While working with json_encode to return JSON data following a file upload, certain users have encountered the addition of unnecessary backslashes in the output. To delve into this issue, let's break down the problem:

The initial code snippet, which produces valid JSON:

print_r($result);
echo json_encode($result);

However, upon further examination through data.toSource(), it's revealed that invalid JSON is being produced, with backslashes added and additional information (e.g., status:200) appended.

Cause of the Issue

The additional backslashes and extraneous information are likely introduced by a process outside of json_encode itself. It's hypothesized that the Plupload bind function may be manipulating the returned data in some way.

Solution

To resolve this issue, it's recommended to include the "JSON_UNESCAPED_SLASHES" option when using json_encode. This option, introduced in PHP version 5.4 and later, prevents backslashes from being added unnecessarily. The corrected code:

json_encode($array, JSON_UNESCAPED_SLASHES);

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